11. [(cosx - sinx) / (cosx + sinx)] [ (cosx - sinx) / (cosx - sinx)] = [(cosx)^2 - 2sinxcosx + (sinx)^2] / [(cosx)^2 - (sinx)^2] = (1 - sin2x) / cos2x = sec2x - tan2x 12 Problem statement truncated (denominator of left side).

Anonymous

Anonymous asked in Science & Mathematics Mathematics · 1 month ago

Trig identity help!?

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stanschim
Lv 7
1 month ago
11. [(cosx - sinx) / (cosx + sinx)] [ (cosx - sinx) / (cosx - sinx)] =

[(cosx)^2 - 2sinxcosx + (sinx)^2] / [(cosx)^2 - (sinx)^2] =
(1 - sin2x) / cos2x = sec2x - tan2x
12 Problem statement truncated (denominator of left side).

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