cos 2A = 2cos²A - 1 #trigonometry #formula1 #maths #mathematics

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  1. Mr. Bidur Bastola
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cos 2A = 2cos²A - 1 #trigonometry #formula1 #maths #mathematics

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(sinA + cosA)/(sinA-cosA)+(sinA - cosA)/(sinA+cosA)=2/(sin^2A-cos^2A)= 2/(2sin^2A-1)=2/(1-2cos^2A)

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If `A=45^(@)`, verify that `(i) sin2A=2sinAcosA` `(ii) cos2A=2cos^(2)A-1=1-2sin^(2)A`

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