Question

Solve for x in the equation Cos40=sin(x+30)

Answer 1

p={x|x is even natural number 1<x<10}

Answer 2

$\cos( \theta) = \sin(90 - \theta ) \\ \cos(40 )= \sin(x + 30) = \sin(50) \\ x + 30 = 50 \\ x = 20$
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