Trigonometric Ratios of Acute and Obtuse Angles

If sin45=0.707, what is sin135?

• -0.707

• 0.707

If cos30=0.866, what is cos150?

• 0.866

• -0.866

If cos60=0.5, what is cos120?

• -0.5

• 0.5

If sin179=0.017, what is sin1?

• 0.017

• -0.017

If cos130=-0.643, what is cos50?

• -0.643

• 0.643

If sin60=0.866 and cos20=0.94, what is sin120+cos160?

• -0.074

• 0.074

• 1.806

If sin60=0.866 and cos20=0.94, what is sin120-cos160?

• -0.074

• 0.074

• 1.806

If sin140=0.643 and cos40=0.766, find sin40 - cos140.

• 1.409

• 0.123

• -0.123

If sin140=0.643 and cos40=0.766, find sin40 + cos140.

• 1.409

• 0.123

• -0.123

If cos110=-0.342, what is cos70?

• 0.342

• -0.342