exam Maths Puzzle Numerical Ability

Could you please help me solve this problem? It is:
tan2x = 1 - secx

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exam Other Question

Multiply:
((x^2+x-12)/(x^2-x-20))X((x^2+2x-35)/(x^2+9x+14)) Find two positive real numbers that differ by 2 and have a product of 10.