СРОЧНООО!!! SOSS! 6sin25°-3 cos 65°+7sin155°/cos53°cos 12°-cos37°cos78° Пожалуйста!!!

(6sin25°-3cos65°+7sin155°)/(cos53°cos12°-cos37°cos78°)=(6sin25°-3cos(90°-25°)+7sin(180°-25°))/(cos(90°-37°)cos(90°-78°)-cos37°cos78°)=(6sin25°-3sin25°+7sin25°)/(sin37°sin78°-cos37°cos78°)=(10sin25°)/(-sin(37°+78°))=(10sin25°)/(-sin115°)=(10sin25°)/(-sin(40°+25°))=(10sin25°)/(-cos25°)=10tg25°/