reduction formula
Britishnoun
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maths a formula, such as sin (90° ± A ) = cos A , expressing the values of a trigonometric function of any angle greater than 90° in terms of a function of an acute angle
Example Sentences
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Apply a reduction formula to evaluate ∫ sec3 x dx.
From Textbooks • Mar. 30, 2016
The last reduction formula is derived by writing tangent in terms of sine and cosine:
From Textbooks • Feb. 13, 2015
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