2sinA+5cosA=4. Prove that cosA=1/2

Prove that 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B) = tanA/2cotA/2

prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA

If 1-cosA=5/13, prove that 25sinA(sinA - cosA)

Prove sinA/1+cosA =tan1/2A

prove that :cosA-sinA+1/cosA+sinA-1=cosecA+cotA

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

prove that 2sinA + 1 / cosA+sin2A=secA

Prove that [sinA/(1-cosA)-(1-cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecA I the second part as...

If a cosA - b sinA = c . Prove that a sinA + b cosA = _+√a^2 + b^2 - c^2

Prove SinA/1-CosA = CosecA + CotA

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