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Verify that 18˚ is a solution of the equation

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sin 2A = cos 30˚

asked Jul 14, 2013 in TRIGONOMETRY by andrew Scholar

1 Answer

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sin 2A = cos 30˚

sin (90-x) = cos x

sin 2A = sin (90-30)

sin 2A = sin (60)

2A = 60

A =30˚

30˚is the solution.

answered Jul 14, 2013 by bradely Mentor

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