exam Maths Puzzle Numerical Ability

Verify the identity.

a)(csc(-t)-sin(-t))/(sin(-t))=cot^(2)t

b)ln cotx= -ln tanx

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exam Other Question

simplify the square root of 20 power 5 minus 1 power the square root of 5 Luis and Julia have the same number of coins. Luis has only dimes and Julia has only quarters. If Julia has $1.80 more than Luis does, how many coins does each have?