book Maths Puzzle Numerical Ability

x^2-19x+90=0
Solve by using quadratic formula

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book Other Question

prove that sin^2 x(1 + cot^2x) = 1. Prove this for ANY angle. Solve the quadratic equation by factoring and applying the zero product principle.

12xsquare - 41x + 24 = 0

Thank you so much