We have to identify t if cos 2x + 2*(sin x )^2 + t = 0
cos 2x + 2*(sin x )^2 + t = 0
use cos 2x = 1 - 2*(sin x)^2
=> 1 - 2*(sin x)^2 + 2*(sin x)^2 + t = 0
=> 1 + t = 0
=> t = -1
The required value of t = -1.
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