Prove tanAsin2A=2sin^2a

prove: 2sinx+sin2x = 2sin^3(x)/1-cosx

Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2) Prove: 2cot-2tanx= 4-2sec^2x / tanx

Prove That 2sin^pi/6 + cosec^7pi/6cos^pi/3 = 3/2

2sin^2x-1=0[0,2pi)

cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)

prove that: sinC+sinD =2sin((C+D)/2)*cos((C-D)/2)

prove that the equation 2sin x cos x +4cos^2 x =1 may be written in the form of tan^2 x -2tan x -3=0

2sin^2(x )+38 cos(x) + 2.6=0

2sin^2 A + 5cosA = 4 , Prove that cos A = 1/2

If 2sin^2∆ =1+Cos∆, 0°<∆<90° find the value of∆

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