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Two forces vecF(1)=5hati+10hatj-20hatk a...

Two forces `vecF_(1)=5hati+10hatj-20hatk and vecF_(2)=10hati-5hatj-15hatk ` act on a single point. The angle between `vecF_(1) and vecF_(2)` is nearly

A

`30^(@)`

B

`45^(@)`

C

`60^(2)`

D

`90^(@)`

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