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AIEEE 2015 Tutorials › 3D and Vectors questions › :\/:><??><:\/:

The value of sine of angle between the vectors 2 i - j + 3 k and 3 i + 2 j + k is

A stupid qs I know

But if i take dot product i am getting cos A = 1/2 so sin A = root 3/2

But if i take cross product i am getting sin A =1 /2

Where's the mistake ??????

#Mathematics #3D and Vectors

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4 Answers

rahul nair ·2010-04-13 04:13:02

ur calculation of cross prod. is wrng....sinA=âˆš3/2

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UTTARA ·2010-04-13 12:42:12

SRY my calc misti

Thanks

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1708

man111 singh ·2010-04-24 22:55:29

(1) a,b ,c are three non zero vectors such that c is not orthogonal to b. If vector r = xi + yj +zk (whrer i,j,k are unit vectors) satisfy r *b =a*b and r.c=0. Then r*a =
(where * denote cross product).

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rocky ·2010-04-25 00:38:54

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Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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