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Prove that sin47^(@)+sin61^(@)-sin11^(@)...

Prove that `sin47^(@)+sin61^(@)-sin11^(@)-sin25^(@)=cos7^(@)`.

A

`cos7^(@)`

B

`sin7^(@)`

C

`2cos7^(@)`

D

`2sin7^(@)`

Text Solution

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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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  18. Prove that sin47^(@)+sin61^(@)-sin11^(@)-sin25^(@)=cos7^(@).

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