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If `ys invarphi=x s in(gamma+delta)=cos(alpha-beta)sin(gamma-delta),` prove that `cotalphacotbetacotgamma=cotdelta`

A

`cot delta`

B

`-cot delta`

C

`tan delta`

D

`-tandelta`

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  5. If sinx+sin^2x=1," then the value of "cos^12x+3cos^10x+3cos^8x+cos^6x-...

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  8. If sin (picot theta)=cos (pi tantheta), then

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