trigonometry

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

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  1. How about some parentheses, so we can tell what's what?

    As it stands, it means

    1 + tan2A = cosA + tanA - sinA

    which is clearly false

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  2. Clive probably meant:
    (1+sin 2A)/cos 2A = (cosA + sinA)/(cosA - sinA)

    LS = (sin^2 A + cos^2 A + 2sinAcosA)/(cos^2 A - sin^2 A)
    = (cosA + sinA)/( difference of squares)
    = ...

    I am sure you can take it from there

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  3. I AM WRONG >

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  4. if x = rsinAcosC,y=rsinA sinC and z = rcosA,then prove that r2= x2+y2+z2

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