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If y= a sin x + b cos x then, y^(2) + (y...

If `y= a sin x + b cos x` then, `y^(2) + (y_(1))^(2)`= ……. `(a^(2) + b^(2) ne 0)`

A

`a cos x - b sin x`

B

`(a sin x- b cos x)^(2)`

C

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

D

0

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The correct Answer is:
C
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