Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 18)
What does '180-θ' represent in relation to the sine function?
An angle in the third quadrant
An angle in the fourth quadrant
An angle that has the same sine value as θ (acute)
An angle that has the same sine value, but opposite sign
คำอธิบาย
sin(180 - θ) = sin θ; thus, it gives the same sine value, reflecting the symmetry.