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If : cot theta =(a)/(b), "then" : a *cos...

If : `cot theta =(a)/(b), "then" : a *cos 2 theta +b * sin 2 theta=` A)`a^(2) +b^(2)` B)`a^(2) - b^(2)` C)a D)b

A

`a^(2) +b^(2)`

B

`a^(2) - b^(2)`

C

a

D

b

Text Solution

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The correct Answer is:
C
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