Question

98(sin²27°-cos²27°) / cos54°
по возможности побыстрее, пожалуйста)​

Answer 1

$frac{98(Sin^{2}27^{o}-Cos^{2}27^{o})}{Cos54^{o}}=frac{98*(-Cos54^{o})}{Cos54^{o} }=-98$

Answer 2

$displaystyle tt frac{98cdotbigg(sin(27^{circ})^2-cos(27^{circ})^2bigg)}{cos(54^{circ})}=frac{98cdotbigg(-cos(54^{circ})bigg)}{cos(54^{circ})}=98cdot(-1)=underline{bold{-98}}$