If 0- A- - -2 and cos- -4-5- find the value of sin 2A

sin 2A=2sin Acos A =2×3/5×4/5=24/25 ...

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Definite Integral as Limit of Sum

If 0< A< π ...

Question

If $0 < A < π / 2$ and $cos π = 4 / 5$ , find the value of $sin 2 A$

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Solution

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sin 2 A = \frac{4}{5}

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