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Question: verify each identity in 8191...

Question details
Verify each identity in #81-91
sin tanx cos x cSCr sec x tan 82) = cos x + sin x secx cscx-1 83) = 1-sin x csc x 84) tan x-1 = sinx-cosx cos x cos x-1 86) cot. xsec x-csc 2 x = sinx sin2 x +cot x 87) = sin. x + cos x csc x 88) sec2 x-csc 2 x = tan2 x-cot2 x 1 +cos x 89) cot x + csc x = - Sinx cot x cos x 91 ) sec, xcos x = tan.. x + 1 secxtan x
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