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The acute angle between r=(-hat(i)+3 hat...

The acute angle between `r=(-hat(i)+3 hat(k))+lambda (2 hat(i)+3 hat(j)+6 hat(k))` and `r. (10 hat(i)+2 hat(j)-11 hat(k))=3`, is

A

`sin^(-1) (8/21)`

B

`cos^(-1) (8/21)`

C

`sin^(-1) (5/21)`

D

`cos^(-2) (5/21)`

Text Solution

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The correct Answer is:
A
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