cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 17:08:42
![cos120°+tan²135°-3/4tan²150°-cos²150°+sin150°的值是多少?非常感激](/uploads/image/z/8763785-17-5.jpg?t=cos120%C2%B0%2Btan%26%23178%3B135%C2%B0-3%2F4tan%26%23178%3B150%C2%B0-cos%26%23178%3B150%C2%B0%2Bsin150%C2%B0%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E9%9D%9E%E5%B8%B8%E6%84%9F%E6%BF%80)
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