exam Maths Puzzle Numerical Ability

hi, can someone help me find the following thank you so much
sin(5pi/3) I think the answer is -square root3/2
cos(7pi/4) I think the answer is square root2/2
tan(5pi/6)
cos(-5

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exam Other Question
solve the equation

x+7 divided by 3 = 37 divided by 15 - x-2 divided by 5


or


x+7/3 = 37/15 - x-2/5 I really need some major help on this one. I figured out the first problem, which my answer is 1/2, but I am stuck on the rest.
f(x)=x/x+1 and g(x)=1/x^2+2x+1, find (a)f(1)+g(1) a