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
Solve the equation In(x+5)- In(3)=In(x-3). Business and Finance. The demand equation for a certain type of printer is given by {{{D=-200p+35,000}}} The supply equation is predicted to be
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