Question

Найдите значение выражения  $frac{6*sin122}{cos61*cos29}$

Answer 1

$frac{6*sin122}{cos61*cos29}=frac{6*sin122}{frac{cos(61-29)+cos(61+29)}{2}}=frac{12sin122}{cos32+cos90}=frac{12sin122}{cos32}=frac{12sin122}{sin(90+32)}=$
$=frac{12sin122}{sin122}=12$