Question

СРОООЧНО 
sin(П/3+L)+sin(П/3-L) упростить

Answer 1

$sin(frac{pi}{3} + L ) + sin(frac{pi}{3} - L ) = \ sinfrac{pi}{3}cosL + sinLcosfrac{pi}{3} + \ + sinfrac{pi}{3}cosL - sinLcosfrac{pi}{3} =\ = 2sinfrac{pi}{3}cosL = cosL$