exam Maths Puzzle Numerical Ability

Solve equation on the interval 0<or equal to x<2Pie
Show all solutions in radian or Pie form
Cos squared (x)-Sin Squared (x) + Sin (x)=0

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exam Other Question

Graph F(x) = 2/x^2-9 Hi, Can I have some help finding f of g of h?

f(x)=sqrt(x), g(x)=x/x-1, h(x)=3sqrt(x)