exam Maths Puzzle Numerical Ability

What is the difference in parentheses versus brackets and when do you use each with regards to interval notation?

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exam Other Question

If sin (theta)=-9/13 and cos (theta)>0, then find the exact value (no decimals) of cos (theta). To clarify....Please help me solve the indicated operation. Thanks!

4.5-3.4^2 / 6-8.2 (the period is for multiplication)