exam Maths Puzzle Numerical Ability

tan^2([pi]/2-[theta])csc^2[theta]+csc^2[theta]=1/sin^4[theta] can you help me verify if this is correct

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exam Other Question
This problem is a matrice problem:)

1 -3 4
0 2 6
-3 1 -1 Find the slope of the line: y+4=6(x-5)