If - - -7 then find the value of 1cos- - 2cos-cos 2-

1 cosα #160; + 2cosα #160; cos2α #160; = 2cos^ 2 α 1+2cosα #160; cosα .cos2α #160; = 2cos^ 2 α +2cosα 1 cosα( 2cos^ 2 α 1 ) #160; Wh ...

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Circular Measurement of Angle

If α = π7 t...

Question

If $α = \frac{π}{7}$ then find the value of $(\frac{1}{cos α} + \frac{2 cos α}{cos 2 α}) .$

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1 + c o s α + c o s^{2} α + . . . \infty = 2 - \sqrt{2}, t h e n α, (o < α < π)

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\frac{π}{2} < α < π

\sqrt{\frac{1 - cos α}{1 + cos α}} + \sqrt{\frac{1 + cos α}{1 - cos α}} =

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