book Maths Puzzle Numerical Ability

I need your help on changing word phrases to mathematical sentences, I need your answers as soon as possible.

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how do you solve:
is triangle DEF, d=5 e=6 f=3 then COS E=????

i have the right set up i believe but i cant get the right answer helpp!!! How is (2a+4)(a-3)-(2a+4)(2a-1)completely factored to get -2(a+2)(a+2)as the answer?