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trigonometric functions
how can I prove cot^2X-1/1+cot^2X=2cos^2X-1
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I assume what you mean is: [cot^2(x) -1]/[1+cot^2(x)] = 2 cos^2(x) -1 Right? First step is convert the cotangent function into cosine over sine. Then multiply through by sin^2(x). Then all you need do is apply the fact that sin^2(x) = 1- cos^2(x) |
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