Q .     If `tan(picostheta)=cot(pisintheta)` then a value of `cos(theta-pi/4)` among the following is

EAMCET 2013
A

`1/(2sqrt2)`

B

`1/sqrt2`

C

` 1/2`

D

`1/4`

HINT

then `picostheta=npi+pi/2-pisintheta`
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