1.

a) lfcos (x-20° ) = sin (3x-10° ), then find the value of x.[1]

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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