Question #55d88

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Answer 1 · 2018-01-12T18:30:11

Refer to a Proof given in the Explanation.

#1+cos^2x/(sinx-1)#,

#=1-cos^2x/(1-sinx)#,

#=1-(1-sin^2x)/(1-sinx)#,

#=1-{(1+sinx)(1-sinx)}/(1-sinx)#,

#=1-(1+sinx)#,

#=1-1-sinx#,

#=-sinx#.