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Needing to find the answer to this question attached. Thank you

Needing to find the answer to this question attached. Thank you-example-1
User Dwergkees
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\sin \theta -1 =0\\\\\ \implies \sin \theta = 1\\\\ \implies \theta = \frac{\pi}2 + 2\pi n\\\\\text{For n =0,}\\\\\theta = \frac{\pi}2

User Ehuang
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