sin ² 9π/2+cos²( -13π/4)-tan²7π/3
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![sin ² 9π/2+cos²( -13π/4)-tan²7π/3](/uploads/image/z/1596443-59-3.jpg?t=sin+%26%23178%3B+9%CF%80%2F2%2Bcos%26%23178%3B%EF%BC%88+-13%CF%80%2F4%EF%BC%89-tan%26%23178%3B7%CF%80%2F3)
sin ² 9π/2+cos²( -13π/4)-tan²7π/3
sin ² 9π/2+cos²( -13π/4)-tan²7π/3
sin ² 9π/2+cos²( -13π/4)-tan²7π/3
sin ² 9π/2+cos²( -13π/4)-tan²7π/3=sin ²( 4π+π/2)+cos²( -4π+3π/4)-tan²(2π+π/3)=sin ²( π/2)+cos²( 3π/4)-tan²(π/3)=1+0.5-3=-1.5