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Value of tan 40°
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Prove that tan20°tan40°tan80°=tan60°
  • 1 answers

Gaurav Seth 3 hours ago

<pre> tan 40 * tan 80* tan 20=(sin 40 *sin 80) * sin 20 /(cos 40 *cos 80 ) cos 20</pre>

 now, multiplying numerator and denominator by 2,

                                 =(2*sin 40*sin 80) *sin 20 /(2 cos 40*cos 80) cos 20]

                                 =(cos 40- cos 120)*sin 20/( (cos 120+ cos 40) cos 20

                                 =(2 cos 40 +1) sin 20 /(2 cos 40-1) cos 20

                                 =(2 cos 40*sin 20 +sin 20) /(2 cos 40 cos 20 -cos 20)

                                 =(sin 60 -sin 20 +sin 20)/ (cos 60+sin 20-sin 20)

                                = sin 60/cos 60

                                 =tan 60.

Find the no. of subsets of the set A=(a, b, c)
  • 1 answers
No. of subset = 2^ n where n is no. Of elements Therefore, it has 8 subset (Phi),(a) , (b) , ( c) , ( a,b) , (a,c) , ( b,c) , ( a,b,c)
In a group of 50 students 14 drink orange juice but not eat apple 30 drink orange juice and each student like at least one of them . Find (i) how many drink orange juice as well as eat apple (ii) how many eat apple but not drink orange juice
  • 3 answers
Same question coming in my xam And i got same answer.

Keshav Bindal 17 hours ago

By Using, n(A U B) = n(A) + n(B) - n(A intersection B) . n(A-B) = n(A) - n(A intersection B)

Keshav Bindal 18 hours ago

i) 30-14 = 16 . ii) Students who eat apple = 50-30+16 = 36 . Students who eat apple, but not drink juice = 36-16 = 20
If sin x=3/5 where 0< x <π/4,then find cos2x
  • 2 answers

Keshav Bindal 17 hours ago

Cos2x = 1-2Sin square x = 1- 2(3/5)^2 = 1- 18/25 = 7/25
Are ye que mera xam m aaya tha aaj My answer was 7 / 25
How to find cumulative frequency ins stats
  • 2 answers

Ishan Singh 1 day, 15 hours ago

Ex f=4 6 7 2 5 Cf =4+6+7+2+5

Ishan Singh 1 day, 15 hours ago

Cf is sum of previous frequency
Subset
  • 0 answers
any one have previous years maths ques pprs
  • 1 answers

Abhinav Agarwal 1 day, 15 hours ago

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Prove that tan20°+tan40°+tan80°=tan60°
  • 1 answers

Abhinav Agarwal 1 day, 14 hours ago

Convert into sin and cos and then solve
2017 and 2018 paper
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Graph of 3 lines
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Find the multiplicative inverse of 4-√-9
  • 3 answers
4/root(16+9)-3i/root(16+9) =4/25-3i/25 =(4-3i)/25

Adarsh Thakur 1 day, 20 hours ago

Firstly u take reciprocal of this value then rationalise the answers is in the form of a+ib

Shatayu Ganvir 1 day, 21 hours ago

Do reciprocol and rationalise it
Show that the points A( 4,6,-5), B(0,2,3) and C(-4,-4,-1) form the vertices of an isoscles triangle
  • 1 answers

Rajat Sharma 1 day, 14 hours ago

Just calculate the distance between ab BC and CA uses distance formula then you will get the measurement of two of the sides equal hence prove that it is an isosceles triangle

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