cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激
问题描述:
cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激
答
cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°
=-1/2+(-1)^2-3/4x1/3-3/4+1/2
=1-1/4-3/4
=0