- Deduce that A\(A\B)= A n B?

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Write −4sin(8t)+5cos(8t) in the form Asin(Bt+ϕ) using sum or difference formulas. −4sin(8t)+5cos(8t)=? Find a and b such that the lines r1(t)={1,2,1}+t{1,−1,1} and r2(t)={3,−1,1}+
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Is the sum of all forces (Fnet) vertical and horizontal forces combined in the same equation?

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