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trigonometric function lowering power formula calculator
u（degree）：
result:
sin
2
θ = 1 − cos
2
θ
cos
2
θ = 1 − sin
2
θ
tan
2
θ + 1 = sec
2
θ
tan
2
θ = sec
2
θ − 1
1 + cot
2
θ = csc
2
θ
cot
2
θ = csc
2
θ − 1
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