exam Maths Puzzle Numerical Ability

(-2-4i)+(3-6i)

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exam Other Question

1 + cos x/sin x = cot x/2

Can someone solve this, it'd be highly appreciated.
For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.

C(x)= 1.4x/100-x