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Using the fact that {{{({A}+{B})}}}={{{A}}}{{{B}}}+{{{A}}}{{{B
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Using the fact that and the differentiation, obtain the sum formula for cosines.

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Practice questions from similar books

Question 1
 Differentiate the following w.r.t. x:

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Question 2
If is a differentiable function such that , \displaystyle{f}

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Question 3
Differentiate the following w.r.t. x:

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Question 4
Differentiate w.r.t. x the function

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Question Text
Using the fact that and the differentiation, obtain the sum formula for cosines.