cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激

cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激
cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激

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

=-1/2+1-3/4*1/3-3/4+1/2
=-1/2+1-1/4-3/4+1/2
=0

cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°
=-1/2+1-3/4x(√3/3)²-(√3/2)²+1/2
=1-3/4x1/3-3/4
=1-1/4-3/4
=0