exam Maths Puzzle Numerical Ability

Please help me solve: sin3A=1, o<=A<2pi.
Thank you, Ray

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exam Other Question

HELP PLEASE!!! another ? I have is c/2-d/5=-4 and 2c/3-3d/5=-7. They are dealing with the substitution method Use the LCD to determine which fraction is greater

27. 5/2,7/3

Any help with this equation would be greatly appreciated:)