18. If cos (40˚ + x) = sin 30˚, find the value of x
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cos(40 + x) = cos(90 - 50 + x)
= sin(50+x)
sin 30 = sin (50+x)
30=50+x
x=20
= sin(50+x)
sin 30 = sin (50+x)
30=50+x
x=20
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