Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 35)
Which of the following statements describes the relationship between sine and cosine functions for supplementary angles?
sin(180 - θ) = cos θ
sin(180 - θ) = -cos θ
sin(180 - θ) = sin θ
cos(180 - θ) = sin θ
Εξήγηση
The sine of an angle and its supplement are equal (sin(180 - θ) = sin θ).