sin ² 9π/2+cos²( -13π/4)-tan²7π/3
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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