Prove

1 - sin

I tried do both LHS and RHS. Got stuck after a step or two.

1 - sin

^{2}x / cosx = sin2x / 2sinxI tried do both LHS and RHS. Got stuck after a step or two.

1 - sin

I tried do both LHS and RHS. Got stuck after a step or two.

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Wilton, CT

(1-sin^{2}x)/cosx=sin2x/2sinx

cos^{2}x/cosx=cosx

sin2x/2sinx=2sinxcosx/2sinx=cosx

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## Comments

x/cosx = sin2x/2sinx instead of what you have written?^{2}