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2 sin^2(pi/2 cos^2 x) = 1 - cos(pi sin 2...

`2 sin^2(pi/2 cos^2 x) = 1 - cos(pi sin 2x)`. if

A

`x = (2n + 1)pi/2, n in I`

B

tan x = 1/2

C

tan x = -1/2

D

`x = (npi)/2, n in I`

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