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2 cos theta - cos 3 theta - cos 5 theta ...

`2 cos theta - cos 3 theta - cos 5 theta - 16 cos^(3) theta sin^(2) theta = `

A

`2`

B

`1`

C

0

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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  12. ( sin 8 alpha * cos alpha - sin 6 alpha * cos 3 alpha )/(cos 2 alpha c...

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  13. ( sin alpha sin 3alpha + sin 3alpha sin 7 alpha + sin 5 alpha sin 15 ...

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  14. ( sin 4 A sin 3A - sin 5A sin 2A+ sin 7A sin 4A )/(cos 2A cos 3A - cos...

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  15. (sin 65^(@) + sin 25^(@))/( cos 65^(@) + cos 25^(@))=

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