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