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What is the component of (3hati+4hatj) a...

What is the component of `(3hati+4hatj)` along `(hati+hatj)` ?

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The correct Answer is:
`15^(@)`
`tan alpha=30/(10sqrt(3))rArr alpha=60^(@)`
`tan beta=20/20rArr beta=45^(@) rArr alpha-beta=15^(@)`
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