Question

Give the sine, cosine and tangent for the point on the Unit Circle at −5/4

Answer 1

we have the angle at -5pi/4

so

the point in the unit circle lies on the 2 quadrant

so

sin(-5pi/4)=sin(pi/4)=√2/2

cos(-5pi/4)=-cos(pi/4)=-√2/2

tan(-5pi/4)=-tan(pi/4)=-1