Proving Trig Identities?

Prove:

Question 1:

1 - sin2x / cos2x = 1 - tanx / 1 + tanx

Question 2:

1 + sin2x / cosx + sinx = cos2x / cosx - sinx

Update:

Ignore question 2, I figured it out.

1 Answer

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  • ted s
    Lv 7
    1 decade ago
    Favorite Answer

    the right side is nothing more than [cos x - sin x] / [ cos x + sin x], multiply top & bottom by [ cos x - sin x] and recognize the forms of cos 2x and sin 2x

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