Trigonometric Formulas

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tan A

sin A _____ cos A

tan A / 2 (2)

sin A ______ 1 + cos A

sin (A + B)

sin A cos B + cos A sin B

sin (A - B)

sin A cos B - cos A sin B

tan (A + B)

tan A + tan B ___________ 1 - tan A tan B

tan (A - B)

tan A - tan B ___________ 1 + tan A tan B

tan A / 2

1 - cos A _______ sin A

sin 2A

2 sin A cos A

tan 2A

2 tan A ______ 1- tan²A

cot A

cos A _____ sin A

cos (A - B)

cos A cos B + sin A sin B

cos (A + B)

cos A cos B - sin A sin B

Pythagorean

cos²A + sin²A = 1 1 + tan²A = sec²A 1+ cot²A = csc²A

cos 2A

cos²A - sin²A 2 cos²A - 1 1 - 2 sin²A


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