Question

7(sin^11°-cos^11°)/cos22°
ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

$\frac{7*( sin^{2} 11^{0} - cos^{2} 11^{0} )}{cos 22^{0} } = \frac{7*(-( cos^{2} 11^{0}- sin^{2} 11^{0} ))}{cos 22^{0} } = \frac{-7*cos(2* 11^{0} )}{cos 22^{0} } =-7$