Question

if vectors l P l , l Q l and l R l have magnitudo 5, 12, 13 units and l P l+l Q l= l R l, the angle between l Q l and l R l is
a. cos^-1 5/12
b. cos^-1 5/13
c. cos^-1 12/13
d. cos^-1 7/13 ​

Answer 1

Step-by-step explanation:

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Given,

$∣P∣ \: = 5, \: ∣Q∣=12  \: and∣R∣=13$

Since,

$cosθ = \frac{Q}{R} = \frac{12}{13}$

Therefore,

$θ = {cos}^{ - 1} ( \frac{12}{13} )$

Hence,

The correct option is =>

$C. ( cos^{ - 1} \frac{12}{13} )$

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Answer 2

Answer:

refer the attachment

Step-by-step explanation:

if vectors l P l , l Q l and l R l have magnitudo 5, 12, 13 units and l P l+l Q l= l R l, the angle between l Q l and l R l is

a. cos^-1 5/12

b. cos^-1 5/13

c. cos^-1 12/13

d. cos^-1 7/13