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If alpha , beta , lambda are three real ...

If `alpha , beta , lambda` are three real numbers and `A=[(1,cos(alpha-beta),cos(alpha-gamma)),(cos(beta-alpha),1,cos(beta-gamma)),(cos(gamma-alpha),cos(gamma-beta),1)]`, then which of following is not true A)A is singular B)A is symmetric C)A is orthogonal D)A is not invertible

A

A is singular

B

A is symmetric

C

A is orthogonal

D

A is not invertible

Text Solution

Verified by Experts

The correct Answer is:
C
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