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We will learn how to prove the property of the inverse trigonometric function arccot(x) + arccot(y) = arccot(xyβ1y+x) (i.e., cotβ1 x - cotβ1 y = cotβ1 (xyβ1y+x)
Proof:
Let, cotβ1 x = Ξ± and cotβ1 y = Ξ²
From cotβ1 x = Ξ± we get,
x = cot Ξ±
and from cotβ1 y = Ξ² we get,
y = cot Ξ²
Now, cot (Ξ± + Ξ²) = (cotΞ±cotΞ²β1cotΞ²+tanΞ±)
cot (Ξ± + Ξ²) = xyβ1y+x
β Ξ± + Ξ² = cotβ1 xyβ1y+x
β cotβ1 x + cotβ1 y = cotβ1 xyβ1y+x
Therefore, cotβ1 x + cotβ1 y = cotβ1 xyβ1y+x
β Inverse Trigonometric Functions
11 and 12 Grade Math
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