book Maths Puzzle Numerical Ability

tanө-cotө/ sinөcosө = sec2ө-csc2ө

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book Other Question

how do your simplify an expression like this one 4+6(8)?? Hi!
I have learned how to remove decimals to make my work easier but not with fractions. Therefore I am submiting this problem:2/3x+1/7y=-11, 1/7x-1/3y=-10 Please help to solve t