Vectors `vec(A)` and `vec(B)` include an angle `theta` between them If `(vec(A)+vec(B))`

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Vectors `vec(A)` and `vec(B)` include an angle `theta` between them If `(vec(A)+vec(B))` and `(vec(A)=vec(B))` respectively subtend angles `apha` and `beta` with A, then `(tan alpha+tan beta)` is
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After watching this i lost interest in solving the q😒

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