(sinx+cosx)21+2sinxcosx\frac{\left(\sin x+\cos x\right)^2}{1+2\sin x\cos x}1+2sinxcosx(sinx+cosx)2
y+11x+7y−7xy+11x+7y-7xy+11x+7y−7x
3x−5=4x+5\frac{3}{x-5}=\frac{4}{x+5}x−53=x+54
e2x+xe2xe^{2x}+xe^{2x}e2x+xe2x
sin7x=(1−cos2x)3sinxsin^7x=\left(1-cos^2x\right)^3sinxsin7x=(1−cos2x)3sinx
3 y −1423\:y\:-14^23y−142
5.4\sqrt{5}.\sqrt{4}5.4
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