Find sin t and cos t for the given value of t t 420 sin t

Find sin t and cos t for the given value of t.

t = 420°

Solution

sint=sin(-420 degree)= -sin(420 degree)= -sin(360degree+60degree)=-sin(60 degree)= -(sqrt3)/2= -0.866

cost=cos(-420 degree)= cos(420 degree)= cos(360degree+60degree)=cos(60 degree)= 1/2=0.5