Question

упростите выражение 9sina cos3a+9sina cosa-3sin3a cos3a-3sin3acosa​

Answer 1

$9 sin( alpha ) times cos(3 alpha ) + 9 sin( alpha ) times cos( alpha ) - 3 sin(3 alpha ) times cos(3 alpha ) - 3 sin(3 alpha ) times cos( alpha ) \ \ 9 sin( alpha ) times cos(3 alpha ) + frac{9 sin(2 alpha ) }{2} - frac{3 sin(6 alpha ) }{2} - 3 sin(3 alpha ) times cos( alpha ) \ \ 9 sin( alpha ) times cos(3 alpha ) + frac{9 sin(2 alpha ) - 3 sin(6 alpha ) }{2} - 3 sin(3 alpha ) times cos( alpha )$

~•~•~•ZLOY_TIGROVSKIY~•~•~•