3D Doubt.Please help.

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The image of the plane x-y+z+6=0 with respect to the plane mirror 4x-2y-6z+14=0 is ax+by+cz+6=0, then the value of cos^-1a+cos^-1b+cos^-1c is equal to

A)pi B)2 pi C)3 pi/2 D) 3 pi

#Mathematics #3D and Vectors

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govind ·2010-02-10 04:05:14

see this post for ur answer
http://targetiit.com/iit-jee-forum/posts/reflection-of-planes-14196.html

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Manmay kumar Mohanty ·2010-02-10 05:08:19

So thing is that i can't understand what u wanna say since i'm new out here.

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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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3D Doubt.Please help.

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