$$\sin \theta \cos(90^\circ - \theta) + \cos \theta \sin(90^\circ - \theta) = ?$$
$$\sin \theta \cos(90^\circ - \theta) + \cos \theta \sin(90^\circ - \theta) = ?$$
$$\sin \theta \sin \theta + \cos \theta \cos \theta = ?$$
$$\sin^ 2 \theta + \cos^2 \theta = 1$$ .....(Trignometry identity)
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