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

1 Answer

balajia's profile pic

balajia | College Teacher | (Level 1) eNoter

Posted on

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