A line makes angles `theta, phi` and `psi` with `X, Y` and `Z`-axes, respectively. Consider the following statement

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Q 2369691515.     A line makes angles `theta, phi` and `psi` with `X, Y` and
`Z`-axes, respectively.

Consider the following statements

I. `sin^2 theta + sin^2 phi = cos^2 psi`

II. `cos^2 theta + cos^2 phi = sin^2 psi`

III. `sin^2 theta + cos^2 phi = cos^2 psi`

Which of the above statements is/arc correct?
NDA 2008 Paper 1
A

Only I

B

Only II

C

Only Ill

D

Both II and1111

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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