exam Maths Puzzle Numerical Ability

May I have some help with this inequality?

Solve the nonlinear inequality. Express the solution using interval notation.

(x + 3)(x + 8) < 0

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exam Other Question

sin(x)cos(x)divided by Cos squared (x)-Sin squared (x) =Tan(x) divided by 1-Tan Squared (x)
Prove that the left is equal to the right show step by step left changed to right side please help me find the inverse of this equation- 2x=5/6