exam Maths Puzzle Numerical Ability

1-tan5Btan2B = (2cos7B/(cos7B + cos3B))

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exam Other Question

The product of the smaller two of three consecutive integers is equal to 23 plus the largest. Find the integers. I need help performing the indicated operation

f(x)=5x+15, g(x)=3x-1

I need to find (f og)(x)