exam Maths Puzzle Numerical Ability

(csc^4 x )- (cot^4 x) states to factor and simplify

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exam Other Question

2nd question is same as 1st, factor tree. How do I do and what is the prime factorization of the number.

90
5 x _
_ x _ x 2
_ x _ x _ x _
Solve the system. Enter the solution cooridinates.
3x+y=-1
9x+3y=-3