exam Maths Puzzle Numerical Ability

When do you use sin^-1 on triangles?

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exam Other Question

simplify square root of 3 times the square root of 75 If One number is 7 less than anoher. If 4 times the smaller number plus 2 times the larger number is 62, find the 2 numbers. will it be 8,15 did I do this right?