Question

What do you mean by half-angle formula?​

Answer 1

Answer:

Half-angle formulas allow the expression of trigonometric functions of angles equal to α/2 in terms of α, which can simplify the functions and make it easier to perform more complex calculations, such as integration, on them. Half-angle formulas are especially useful in finding the values of unknown trigonometric functions. For any angle α, the half-angle formulas state that, where the function is positive if α is in the first or second quadrant and negative if α is in the third or fourth quadrant;, where the function is positive if α is in the first or fourth quadrant and negative if α is in the second or third quadrant; and.

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