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Question Number 133240 by rexford last updated on 20/Feb/21

Answered by Kunal12588 last updated on 20/Feb/21

$$r\cos \gamma =2$$$$\cos \gamma =\frac{2}{\sqrt{4+1+4}}=\frac{2}{3}$$$$\gamma ={\cos }^{-1}\frac{2}{3}$$

Answered by mr W last updated on 20/Feb/21

$$a=(2,1,2)$$$$z=(0,0,1)$$$$\cos \theta =\frac{a\cdot z}{\mid a\mid \mid z\mid }=\frac{2\times 1}{\sqrt{2^2+1^2+2^2}}=\frac{2}{3}$$$$\theta ={\cos }^{-1}\frac{2}{3}\approx 48.19°$$

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