s ( 40 ^ { 0 } + x ) = \operatorname { sin } 30 ^ { \circ } – InterviewSolution

1.

s ( 40 ^ { 0 } + x ) = \operatorname { sin } 30 ^ { \circ }

Answer»

cos (40+x) = 1/2

We know that cos 60 = 1/2

40+x = 60

x = 20

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