exam Maths Puzzle Numerical Ability

Will someone please help me with this problem?
Find the exact, rationalized value of tan 105 degrees.
Thank you, Ray

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exam Other Question

The formula i=prt give the interest on a simple investment. What is the formula solved for p? Please help me with this problem:
Let f(x)=ln(x^2) for x > 0 and g(x)=e^(2x) for x is greater than or equal to 0. Let H be the composition of f with g, that is, H(x)=f(g(x)), and