exam Maths Puzzle Numerical Ability

Can someone please help me simplify this expression?
Use trigonometric identities to simplify the expression
(csc theta)(1-cos ^2 theta)(cot theta)

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exam Other Question

Please help me simplify the expression:

13[6^2/(5^2-4^2)+9], I got 169 as the answer.
solve for x:

(6-x)/3 + x/-5 = -7