Math: why sin(180° – x) = sinx
Tutoring math, trig identities are important. The tutor mentions one. An identity, meaning something always true, is sin(a – b) = sin(a)cos(b) – cos(a)sin(b) Therefore, sin(180° – x) = sin(180°)cos(x) – cos(180°)sin(x) Since sin(180°) = 0 and cos(180°) = -1 …