CosA x cos2A + ((sin2A)^2)/2cosA

x=2cosa-cos2a,y=2sina-sin2a

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA

Sin4A - cos4A = sin2A - cos2A Can i just square root the left side??:O

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

Find cos2A when cosA = -3/5 and π/2<A<π. A) -24/25 B) -7/25 C) 7/24 D) 24/7

Prove : 1 + Sin2A/ Cos2A = CosA + SinA / CosA- SinA

1-cosA+sinA DIVIDED BY 1+cosA+sinA

Prove that (cos2A)÷ ( 1+sin2A) = (cotA -1) ÷ (cotA +1)

f(a)=sin2a(10^sin2a). find f'(a)

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