If $sin\theta + cos\theta$ = $\sqrt{2} sin (9O^{0} - \theta)$ then $cot\theta $ is equal to :

If $sin\theta + cos\theta$ = $\sqrt{2} sin (9O^{0} - \theta)$ then $cot\theta $ is equal to :
1). $\sqrt{2}$
2). 0
3). $\sqrt{2}-1$
4). $\sqrt{2}+1$

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