# `(9pi)/4` Evaluate the sine, cosine and tangent of the angle without using a calculator.

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Student Comments

balajia | Student

sin(9pi/4)=sin(2pi+pi/4)=sinpi/4=sqrt(2)/2

cos(9pi/4)=cos(2pi+pi/4)=cos(pi/4)=sqrt(2)/2

tan(9pi/4)=tan(2pi+pi/4)=tan(pi/4)=1