Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 44)
Which trigonometric functions are needed to solve non-right-angled triangles?
Sine
Cosine
Tangent
Pythagorean Theorem
הֶסבֵּר
Sine and Cosine are used to solve non-right angled triangles.