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If :cos x pm sin x =sqrt(2)*cos(x pm alp...

If :`cos x pm sin x =sqrt(2)*cos(x pm alpha), "then" : alpha=` A) `45^(@)` B)`60^(@)` C)`90^(@)` D)`150^(@)`

A

`45^(@)`

B

`60^(@)`

C

`90^(@)`

D

`150^(@)`

Text Solution

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The correct Answer is:
A
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