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Assertion : The sum of squares of cosine...

Assertion : The sum of squares of cosines of angles made by a vector with X, Y and Z axes is equal to unity.
Reason : A vector making `45^(@)` with X-axis must have equal components along X and Y-axes.

A

If both Assertion & Reason are Tune & the Reason is a correct explanation of the Assertion. `

B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

C

If Assertion is True but the Reason is False.

D

If both Assertion & Reason are false.

Text Solution

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The correct Answer is:
3
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