Cosine rule:Let us learn about cosine rule In trigonometry, the law of cosines (also known as the cosine formula or cosine rule) is a statement about a general triangle that relates the lengths of its sides to the cosine of one of its angle.Next we will understand the product rule,in calculus, the product rule (also called Leibniz's law; see derivation) is a formula used to find the derivatives of products of functions. Hope you like the above example of cosine rule.Please leave your comments, if you have any doubts.
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