Find the function value using a calculator set in RADIAN mod

Find the function value using a calculator set in RADIAN mode. sin(-3 Pi/4) Select the correct choice below and fill in any answer boxes within your choice. sin(-3 Pi/4)Equal to

Solution

sin(-3pi/4)
=sin(-3*180/4)
=sin(-135)=sin(360-135)=sin(225)
=sin(pi+pi/4)
=-sin(pi/4)
=-1/root(2)
=-0.707