If 1-cos-cos 2-2-2- then -0- is

The correct option is D 1 cosα = 1/2 √(2) = 1 + 1/√(2) ⇒cosα = 1/√(2) = cos3π/4⇒α = 3π/4. ...

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If 1+cosα+cos...

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If $1 + cos α + {cos}^{2} α + . . . . \infty = 2 - \sqrt{2},$ then $α, (0 < α < π)$ is

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