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    • Posted by Sneha S 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Jatin Mann 7 years, 4 months ago



    sec8θ−1/sec4θ−1 =tan8θ/tan2θ
    Or sec8θ−1/tan8θ=sec4θ−1/tan2θ
    LHS 
    =1/cos8θ−1/sin8θ/cos8θ
    =1−cos8θ/sin8θ  
    =2sin2(4θ)/2sin4θcos4θ 
    =tan4θ
    RHS
    =sec4θ−1/tan2θ
     =1/cos4θ−1/tan2θ
    =1−cos4θ/cos4θ(tan2θ)
    =2sin2(2θ)cos4θ×sin2θcos2θ
    =2sin2θcos2θcos4θ
    =sin4θ/cos4θ
    = tan4θ
     = LHS

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    • Posted by Lovish Kumar 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Vijay Arora 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Aman Preet 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Anantha Krishnan 8 years, 3 months ago

    Identity function: A function f:R to R defined by f(x) = x , where x belongs to R, is identity function. Domain and range = R Constant function: A function f:R to R defined by f(x) = C where x belongs to R and C is constant, is constant function. Domain = R Range = C

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    • Posted by Adnan Alam 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Ravi Sungh 8 years, 3 months ago

    18

    2Thank You

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    • Posted by Ananya Anand 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 4 answers

    Mizanur Khan 8 years, 3 months ago

    जिसे हम a+iota b की form मे लिख सके.

    1Thank You

    Shariq Ahmad 8 years, 3 months ago

    Those no. Which are not real Example = √-1

    0Thank You

    Pratham Kochhar 8 years, 3 months ago

    complex numbers are those which are in iota form

    0Thank You

    Rahul Poddar 8 years, 3 months ago

    The combination of real and imaginary number is called complex number which is denoted by z=x+iy

    4Thank You

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    • Posted by Shruti Rai 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Rahul Poddar 8 years, 3 months ago

    Tan15°=root (2-root3)/root (2+root3) and cot15° is reciprocal of tan

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    • Posted by Purva Khobragade 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Yangbiu Goik 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Jai Aggarwal 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Madan Gopal 8 years, 3 months ago

    √5-1/4

    0Thank You

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    • Posted by Rekha Pandey 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 2 answers

    Meghna Tyagi 8 years, 3 months ago

    Permutation means selection

    0Thank You

    Deepti Choudhary 8 years, 3 months ago

    Permutation is an arrangement in a definite order of a number of objects taken some or all at a time. The number of permutations of an different objects taken all at a time 0<r≤n And objects do not repeat is n (n-1)(n-2)_______ (n-r+1) which is denoted by n P r. .

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    • Posted by Shubham Bhardwaj 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Ashish Singh 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Sajal Dhamija 8 years, 3 months ago

    Answer 12÷6=2?

    0Thank You

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    • Posted by Sajal Dhamija 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Singh Anurag 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Sufyan Khan 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Ravi Kumar 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Anmol Kaur 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Rahul Sharma 7 years, 10 months ago

    0Thank You

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    • Posted by Mohit Kumar 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Shivam Dwivedi 8 years, 3 months ago

    Since discriminant of x is less than 0 ,therefore there is no real roots.so the set is {} means it is empty set.

    2Thank You

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    • Posted by Bittu Kumar 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER
    T

    • Posted by Nishant Gupta 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Sujita Sujita 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Vijay Arora 8 years, 3 months ago

    Step 1, For n =1 7^1-3^1 =4.which is divisible by 4. Step 2, Given statement is true for n=1, It must be true for n=k, 7^k-3^k=(M) 4 [As it is divisible by 4, let =(M) 4 where M is a positive integer.]...... (1) Step 3, For n=k+1, 7^(k+1)-3^(k+1) 7^k×7^1-3^k×3^1 Using equation (1) {(M) 4+3^k} ×7^1-3^k×3^1 (M) 4×7+3^k×7-3^k×3 7(M)4+3^k(7-3) 7(M)4+3^k×4 7(M)4+3^k×(M)4 7 is multiplied with number which is divisible by 4 and added to positive number which is also divisible by 4. Therefore the resultant is also a divisible by 4.

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    • Posted by Khushboo Sharma 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Deepu Tiwari 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Vinay Verma 8 years, 3 months ago

    360

    0Thank You

    ANSWER

    • Posted by Ajay Singh 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Aman Kumar 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Deepanshu Jaiswal 8 years, 3 months ago

    3/16

    2Thank You

    ANSWER

    • Posted by Sajjan Thood 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Pawan Gupta 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Mizanur Khan 8 years, 3 months ago

    To use of blue pen.??

    2Thank You

    ANSWER

    • Posted by Phaaaa Brothers 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Ankit Bishnoi 8 years, 3 months ago

    n!/(n-r)!

    3Thank You

    ANSWER

    • Posted by Adnan Alam 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Sajjan Thood 8 years, 3 months ago

    The electrons revolves around the nucleus in ellipital orbits having discrete energy which is given by n=2.17×n210_18=2 where is atomic number and n is number of orbits

    1Thank You

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