Prove that
(1+cos Y-2cos^2Y)/sin^2Y=1+ cosY/(1+cosY)?

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Prove that (1+cos Y-2cos^2Y)/sin^2Y=1+ cosY/(1+cosY)? ... (1+cos Y-2cos^2Y)/sin^2Y=1+ cosY/(1+cosY) LHS=(1+cos Y-2cos^2Y)/sin^2Y =(1+cos Y−2cos^2Y)/ ...
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Positive: 50 %

sin 2 = q 1 cos 2 cos 2 = q 1+cos 2 tan 2 = q 1+cos tan 2 = 1 cosx sinx tan 2 = sin ... cos x y 2 cosx cosy= 2sin x+y 2 sin x y 2 The Law of Sines sinA a ...
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Positive: 47 %

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sin 2 = q 1 cos 2 cos 2 = q 1+cos 2 tan 2 = q 1+cos tan 2 = 1 cosx sinx tan 2 = sin ... cos x y 2 cosx cosy= 2sin x+y 2 sin x y 2 The Law of Sines sinA a ...
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Positive: 50 %

Prove sin^4(π/8)+sin^4(3π/8)+sin^4(5π/8)+sin ... (π/8)sin^4(π/8) =9/16-1/32 =17/32 cos^8(π/8)+cos^8(3π/8)+cos^8(5π/8)+cos^8(7π/8) =cos^8(π/8)+cos^8
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50 %