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If alpha and beta are angles in the firs...

If `alpha` and `beta` are angles in the first quadrant sucn than `tan alpha = 1/7` and `sin beta = (1)/(sqrt10)` , then `alpha + 2 beta = `

A

`30^@`

B

`45^@`

C

`75^@`

D

`90^@`

Text Solution

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The correct Answer is:
B
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