1.

What mass of sodium hydroxide is dissolved in 500ml of solution so that the strength of solution may be 10 g /l

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ANSWER:

$$\begin{lgathered}\small{ \implies \frac{sin \theta - cos\theta}{ sin \theta + cos\theta} } \\ \\ \implies - \frac{ \frac{sin \theta - cos\theta}{sin \theta} }{ \frac{sin \theta + cos\theta}{sin \theta}} \\ \\ \implies \frac{ \frac{sin \theta}{sin \theta} - \frac{cos\theta}{sin \theta} }{ \frac{sin \theta}{sin\theta} + \frac{cos\theta}{sin \theta} } \\ \\ \implies \small{ \frac{1 - cot\theta}{1 + cot \theta}}\end{lgathered}$$


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