Question

Вычислите 8корень2cos(-п/3)Sin(-п/4)

Answer 1

$8sqrt{2} cos(-frac{pi}{3})sin(-frac{pi}{4}) =8sqrt{2}cosfrac{pi}{3}(-sinfrac{pi}{4})=-8sqrt{2} cdotfrac{1}{2} cdotfrac{1}{sqrt{2}} =-4$