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If tan(picostheta)=cot(pisintheta), the...

If `tan(picostheta)=cot(pisintheta),` then prove that `cos(theta-(pi)/(4))=pm(1)/(2sqrt(2))`

A

`(1)/(2sqrt2)`

B

`(1)/(sqrt2)`

C

`1/2`

D

`1/4`

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A
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