exam Maths Puzzle Numerical Ability

let cos A= 1/5^(1/2) with A in Q 4. find tan 2A

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my problem is I need to find the domain and range for f(x)=The Square Root of
25-(X^2)....all terms are under the square root symbol. ALSO where can I see if its increasing or decreasing? When two fair dice are rolled, the sum of the two dice can be any number from 2 through 12. What is the probability that this sum will be exactly a 7? Please show me how to solve this.