exam Maths Puzzle Numerical Ability

f(x)=x^4+1

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exam Other Question

19-3n=-2n In studying the emission of light, in order to determine the angle at which the intensity is a giving value, the equation sin^2(A) - 4sin(A) + 1 = 0 must be solved. Find the angle A (to 0.1 of a degree). (sin^2(A) = (sinA)^2.