Triple angle formulas. You can easily reconstruct these from the addition and double angle formulas.
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The half-angle formulas 😍. The ones for sine and cosine take the positive or negative square root depending on the quadrant of the angle θ/2.
For example, if θ/2 is an acute angle, then the positive root would be used.
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The Pythagorean Theorem:
If a and b are the lengths of the legs of a right triangle and c is the length of the hypotenuse, then the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse.
This relationship i…https://t.co/n5PzwddCum