Prove that `(cos(pi +theta)cos (-theta))/(cos(pi-theta) cos (pi/2+thet – InterviewSolution

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1.	Prove that `(cos(pi +theta)cos (-theta))/(cos(pi-theta) cos (pi/2+theta))=-cot theta`
Answer» LHS `(cos(pi+theta)cos(-theta))/(cos(pi-theta)cos(pi/2+theta))` `(costhetacostheta)/(costheta*(-sintheta)` `-costheta/sintheta=-cottheta=RHS`

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