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Help please!!! thx...

Help please!!! thx...-example-1
User Denees
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\\ \sf\longmapsto cos\theta=(3)/(√(13))

We know


\boxed{\sf sin^2\theta=1-cos^2\theta}


\\ \sf\longmapsto \sin( \theta) = \sqrt{1 - { \cos}^(2) \theta } \\ \\ \sf\longmapsto \sqrt{1 - {( (3)/( √(13) )) }^(2) } \\ \\ \sf\longmapsto \sqrt{1- \frac{ {3}^(2) }{ {( √(13)) }^(2) } } \\ \\ \sf\longmapsto \sqrt{1 - (9)/(13) } \\ \\ \sf\longmapsto \sqrt{(13 - 9)/(13) } \\ \\ \sf\longmapsto \sqrt{ (4)/(13) } \\ \\ \sf\longmapsto (2)/( √(13) )

User Basicxman
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