Prove that cos^2(45+A)+cos(45-A) = yan(60+A)tan (30-A)
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Answer:
Step-by-step explanation:
Cos²(45+A)+cos²(45-A) = Tan(60+A)Tan (30-A)
=> Cos²(45+A)+cos²(45-A)/Tan(60+A)Tan (30-A) = 1
L.H.S:
Cos²(45+A) + SIn²(90 - 45 +A)/Tan(60+A). Cot (90 - 30+A)
= Cos²(45+A) + Sin²(45+A)/Tan(60+A). Cot (60+A)
= 1
= R.H.S
Hence proved.
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