જો $2{\cos ^2}\theta - 2{\sin ^2}\theta = 1$,તો $\theta =$ .....$^o$
જો $2{\cos ^2}\theta - 2{\sin ^2}\theta = 1$,તો $\theta =$ .....$^o$
- A
$15$
- B
$30$
- C
$45$
- D
$60$
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- [IIT 1975]
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