Q77. Which of the following statements is incorrect?Mathematics — Trignometry — Question 77 of 479A. sin(180° + α) sin(90° − α) = sin α cos αB. sin 780° sin 480° + cos 120° sin 30° = 1/2C. cos 306° + cos 234° + cos 162° + cos 18° = 0D. cos 330° sin 600° + cos 120° sin 150° = −1Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →