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If 3cos^2A + 6sin^2A = 3,0^@ le A le 90^...

If `3cos^2A + 6sin^2A = 3,0^@ le A le 90^@`, then the value of A is :

A

`30^@`

B

`0^@`

C

`90^@`

D

`45^@`

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