exam Maths Puzzle Numerical Ability

Find all solutions of the equations in the interval [0, 2π) algebraically.

sec�x � secx = 2

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exam Other Question

how would you answer this problem x+y<6
and x-y > 1 1/3(s-2)=s +4

I first distribute, and I got s/3-2/3=s +4
I added 2/3 and ended up with s/3= 14/3 is this right or am I missing a step?