sin² 2π/3 + cos² 5π/6 -tan² 3π/4
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convert radian into degree
sin²120+cos²150+tan²135
I think you can solve now
Sin120=cos30
cos150=-cos30
tan135=-cot45
sin²120+cos²150+tan²135
I think you can solve now
Sin120=cos30
cos150=-cos30
tan135=-cot45
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