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CosX sec^2X tanX - cosX tan^3X = sinX

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asked Sep 8, 2018 15.7k views

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CosX sec^2X tanX - cosX tan^3X = sinX

Mathematics
high-school

Chris Boesing asked

by Chris Boesing

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$\cos x\sec^2x\tan x-\cos x\tan^3x=\cos x\tan x\left(\sec^2x-\tan^2x\right)=\sin x\left(\sec^2x-(\sec^2x-1)\right)=\sin x$

Ingo Mi answered Sep 12, 2018

by Ingo Mi

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CosX sec^2X tanX - cosX tan^3X = sinX

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