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Question Number 168086 by mokys last updated on 02/Apr/22

Answered by som(math1967) last updated on 03/Apr/22

$$4.Anglebetween2x+y-2z=5$$$$and3x-6y-2z=7$$$$\theta ={\cos }^{-1}\frac{2\times 3+1\times (-6)+(-2)\times (-2)}{\sqrt{2^2+1^2+{(-2)}^2}\sqrt{3^2+{(-6)}^2+{(-2)}^2}}$$$$={\cos }^{-1}\frac{4}{\sqrt{9}\sqrt{49}}={\cos }^{-1}\frac{4}{21}$$

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