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QUESTION
Q
If tan (5x − 10°) = cot (5y + 20°), then the value of (x + y) is ?  

Solution

tan (5x − 10°) = cot (5y + 20°) cot (5y + 20°) = tan (90° − (5y + 20°)) Therefore, tan...

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Solution

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Keynote

tan (x) = cot (90° − x) cot (x) = tan (90° − x)

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