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

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

Prove tanAsin2A=2sin^2a

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

What does this mean: Sie sind sehr hubsch. ??? :)

sgr2 sinD cosD=sinD

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

Prove that sinA+sinB+sinC=-4cosA/2cosB/2cosC/2

What are sinD and secD ? Right triangle C D E is shown. Side C D is the hypotenuse and it is l...

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