exam Maths Puzzle Numerical Ability

5y, 7y, +6 =

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exam Other Question

Been trying to verify this identity:

cot(x) / 1 + sin(x) = csc(x) * sec(x) - sec(x)

Any pointers would be appreciated. -12 1/5 - 3 3/10

Im Not Quite Sure How To DO This Problem. I know i simplify it first
-12 2/10 - 3 3/10
THEN WHAT???
please help me out and show the steps

THANK YOU
Conner