exam Maths Puzzle Numerical Ability

Please help. What is (2xsqrt2x)(3sqrt5x)simplified?

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exam Other Question

I need help solving this question: Find all solutions of x^1/log x=5 Verify the identity using Aultiple-Angle Formulas. I am totally lost help would be appreciated.

1a) cos^(4)x-sin^(4)x=cos2x

1b) tanθ+cotθ=2csc2θ