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| Math Central | Quandaries & Queries |
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Question from Kim, a student: I am having trouble proving this trig identity (sin^2 x + 2 cos x-1) / 2+cos x - cos^2 x = 1/ (1+ sec x) |
Kim,
I assume the left side is
Factor the denominator, use the fact that 1 - sin2x = cos2x and simplify.
On the right side write secx = 1/cosx and simplify.
Penny
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