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If A=[(cos^(2)alpha, cos alpha sin alpha...

If `A=[(cos^(2)alpha, cos alpha sin alpha),(cos alpha sin alpha, sin^(2)alpha)]` and `B=[(cos^(2)betas,cos beta sin beta),(cos beta sin beta, sin^(2) beta)]` are two matrices such that the product AB is null matrix, then `alpha-beta` is

A

`alpha=beta`

B

`cos (alpha-beta)=0`

C

`sin(alpha-beta)=0`

D

None of these

Text Solution

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The correct Answer is:
B
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ARIHANT MATHS-TRIGONOMETRIC FUNCTIONS AND IDENTITIES-Exercise (Questions Asked In Previous 13 Years Exam)
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  15. If A = sin^2x + cos^4 x, then for all real x :

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