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a) lfcos (x-20° ) = sin (3x-10° ), then find the value of x.[1] |
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Answer» cos ( x - 20) = sin ( 3x - 10) sin (90-(x - 20)) = sin ( 3x - 10) 90 - x + 20 = 3x - 10 90 + 30 = 4x x = 120/4 x = 30° |
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