Question

Помогите решить!!
6sin(114П)*cos(-94П)

Answer 1

$frac{6}{sinfrac{11}{4}pi }cdot cos(-frac{9}{4}pi )=frac{6cos(2pi +frac{pi}{4})}{sin(2pi +frac{3pi }{4})}=frac{6sinfrac{pi}{4}}{sinfrac{3pi }{4}}=frac{6cdot frac{sqrt2}{2}}{frac{sqrt2}{2}}=6\\cos(-frac{9}{4}pi)=cosfrac{9}{4}pi$