I need to prove the following: 1) (1 + cotX)/(cosecX) - (secX)/(tanX + cotA) = cos and 2) (5 - 7cos^2X)(sin^2X) = 5 - 2cot^2X
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Originally Posted by Gilesy I need to prove the following: 1) (1 + cotX)/(cosecX) - (secX)/(tanX + cotA) = cos and 2) (5 - 7cos^2X)(sin^2X) = 5 - 2cot^2X Replace all trig functions by the equivalent in terms of sines and cosines and simplify. RonL
Originally Posted by Gilesy [snip] 2) (5 - 7cos^2X)(sin^2X) = 5 - 2cot^2X Note that the numerator can be written as .
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