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sin(0)
0;cos(0)
sin(π/2)
1;cos(π/2)
sin(π)
0;cos(π)
sin(3π/2)
-1;cos(3π/2)
sin(2π)
0;cos(2π)
sin²θ + cos²θ
1;
1 + tan²θ
sec²θ;
1 + cot²θ
csc²θ;
sin(-θ)
-sin(θ);cos(-θ)
sin(π - θ)
sin(θ);cos(π - θ)