1+cos@/1-cos@=tan*2@/(sec@-1)*2
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You can use this fact to help you keep straight that cosecant goes with sine and secant goes with cosine. The following (particularly the first of the three below) are called "Pythagorean" identities. sin2(t) + cos2(t) = 1. tan2(t) + 1 = sec2(t) 1 + cot2(t) = csc2(t)
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answer is in the pic mate
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