exam Maths Puzzle Numerical Ability

If we extablish an identity, sinAcscA-sin^2*A could equal which of the following quantities?
1. 1
2. cos^2*A
3. sin^2*A-1
4. tan^2*A

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exam Other Question

Please can you help me with this problem?

sqrt 30x-15 = x+7
I cant seem to figure theses out and need some help:
Add. express your answer in simplist form
[x^2/x+10]+[9x-10/x+10]

and
[x/14]+3x/14]

Thank you


Thank you