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Essential_Mathematical_Meth_Arfken_Weber_ 1.3.7 Using the vectors P = ˆx cos θ + ˆy sin θ, Q =...

Essential_Mathematical_Meth_Arfken_Weber_

1.3.7 Using the vectors
P = ˆx cos θ + ˆy sin θ,
Q = ˆx cos ϕ − ˆy sin ϕ,
R = ˆx cos ϕ + ˆy sin ϕ,
prove the familiar trigonometric identities
sin(θ + ϕ) = sin θ cos ϕ + cos θ sin ϕ,
cos(θ + ϕ) = cos θ cos ϕ − sin θ sin ϕ.

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Answer #1


The angle betumen and Q is Oty, from the dot suoduct and cuon product of these tworeceus, on can Obtain, Sul Oto = 8 x P F Si

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