[cosx(cos²x-1)]/[sinx(sin²x-1)]=(-sin²x*cosx)/(-cos²x*sinx)=sinx/cosx=tgx
sin²x+cos²x=1
-sin²x=cos²x-1
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[cosx(cos²x-1)]/[sinx(sin²x-1)]=(-sin²x*cosx)/(-cos²x*sinx)=sinx/cosx=tgx
sin²x+cos²x=1
-sin²x=cos²x-1