Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 6 - No. 31)
What is the relationship between the sine of an angle and the sine of its supplement (180° - angle)?
They are equal.
They are negative of each other.
The supplement's sine is twice the angle's sine.
The supplement's sine is half the angle's sine.
Giải thích
sin(θ) = sin(180° - θ)