CBSE > Class 11 > Mathematics | CBSE Board | Homework Help

Sin10.sin30.sin50.sin.70=1/16 (Taking the value of sin30°= 1/2) also sin50°= sin60-10& sin70°= sin60+10(it can be written as this) 1/2 [ sin(60-10)sin(60+10)sin10° 1/2 [sin²60- Sin²10]sin10° 1/2[3/4 - sin²10]sin10°..( sin60=√3/2)&(√3/2)²= 3/4) Now 1/8[ 3sin10°- 4sin³] by using value of sin 3X 1/8 [sin3X] x= 10 1/8[sin3× 10] 1/8[ sin30°] ie. 1/8×1/2= 1/16 Hence proved... #PanDat_Golu❤

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2c8

Posted by Hacker Ap 6 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Nishant Bansal 6 years, 3 months ago

Not possible as a equation of power 2 cannot have value of r as 8

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Crossfire 19 into cos 2519 into cos 53 into cos 45 19

Posted by Umesh Yadav 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Sinb-c/2=b-c/a.cosA/2

Posted by Trilokchand Gupta 6 years, 3 months ago

CBSE > Class 11 > Mathematics

2 answers

Raj Sahu 6 years, 3 months ago

prove ya solve

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Raj Sahu 6 years, 3 months ago

Bhai carna kya hai

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Let f be the subset of z×z defined by f={ab,a+b:a,b element of z}.is f a function from z to z?justify your answer.

Posted by Mohd Imtiyaz 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Cosxcosx by 2 -cos3xcos9x by 2= sin4xsin7x by 2

Posted by Anjali Bino 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Binomial theorem Expersing binomial theorem, evaluate each of the following (96) power 3

Posted by Pintu Yadav 6 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Ritika Goyal 6 years, 3 months ago

It can be written in the form (100-4)whole cube and then it can be solved using binomial theorem

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If sum of p term is q and sum of q term is p then show that sum of p+q term is –(p+q)

Posted by Gautam Agarwal 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Solve for ×_X+8/X+2>2

Posted by Khushboo Pal 6 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Ashish Mishra 6 years, 3 months ago

Its really simple. Let x+2 to rhs and then solve it

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Find 9th term of the following series 5,10,20,40

Posted by Anubhav Atrey 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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If tanx + tan(x+60) + tan(x+120) = 3 Then prove that 3tanx - tan³x = 1 - 3tan²x

Posted by Aryan Gupta 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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A={1,2,3} B={6,8,9} So find AUB

Posted by Akash Yadav 6 years, 3 months ago

CBSE > Class 11 > Mathematics

2 answers

Mohd Imtiyaz 6 years, 3 months ago

A union B={1,2,3,6,8,9}

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Disha Verma 6 years, 3 months ago

A union B = {1,2,3,6,8,9}

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f(x+1/x)=x^2+1/x^2 x is not equal to 0 fin f(x)

Posted by Lucky Gupta 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Write the set of all vowels in english alphabet which precede s.

Posted by Devesh Yadav 6 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Devesh Yadav 6 years, 3 months ago

A= {a,e,i,o}

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If tanx=(m/m+1) and tany=(m/m+1) show that x+y=45°

Posted by Nikhil Kumar Gautam 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Mid term sylabus

Posted by Sourav Sharma 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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Find the sum of infinity in each of the following geometric progression

Posted by Priyanshu Tariyal 6 years, 3 months ago

CBSE > Class 11 > Mathematics

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cosa.cos2A.cos4Acos8A=sin16A÷16SINA

Posted by Raj Sahu 6 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Gaurav Seth 6 years, 3 months ago

CosAcos2Acos4Acos8A
=1/2sinA[(2sinAcosA)cos2Acos4Acos8A]
=1/2sinA(sin2Acos2Acos4Acos8A)
=1/4sinA[(2sin2Acos2A)cos4Acos8A]
=1/4sinA(sin4Acos4Acos8A)
=1/8sinA[(2sin4Acos4A)cos8A]
=1/8sinA(sin8Acos8A)
=1/16sinA(2sin8Acos8A)
=1/16sinA(sin16A)
=sin16A/16sinA (Proved)

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A wire of length 121cm Bent as so as To lie along arc of cirlce Of radius 180 cm. Find the degree and angle subtended by arc

Posted by Eclair Choco 6 years, 3 months ago

CBSE > Class 11 > Mathematics