If r_1 ^(→) =(sinθ,cosθ,θ), r_2 ^(→) =(cosθ,−sinθ,−3) and
r_3 ^(→) =(2,3,−1), find (d/dθ){r_1 ^(→) ×(r_2 ^(→) ×r_3 ^(→) )} at θ=0

Nimnim111118


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