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(sin^(2)3A)/(sin^(2)A)-(cos^(2) 3A)/(cos...

`(sin^(2)3A)/(sin^(2)A)-(cos^(2) 3A)/(cos^(2)A)=`

A

`cos 2A`

B

`8 cos 2A `

C

`1//8 cos 2A `

D

none

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )
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  6. If 2A+B=(pi)/2 " then " sqrt((1+ sin B)/(1-sinB))=

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  7. If tan x=(b)/(a) " then " sqrt((a+b)/(a-b))+sqrt((a-b)/(a+b))=

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  8. If tan(pi//4+ theta ) + tan(pi//4- theta )= k sec 2 theta , then th...

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  9. If x+(1)/x=2 cos theta , " then " x^(3)+(1)/(x^(3))=

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  10. If (sin alpha )/(a) = ( cos alpha )/(b) , then a sin 2alpha + b cos 2...

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  11. If x=sqrt((1- cos theta )/(1+ cos theta )), " then " (2 x)/(1-x^(2))=

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  12. If tan theta = 3//4 , then the value of tan 2 theta + sec 2 theta ...

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  13. If cos x= tan y , coty= tan z , cot z= tan x then sin x=

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