Which of the following expressions are identities and which are equations? (a) $(\cos x + \sin x)^2 = 1 + \sin(2x)$ (b) $\tan x - \cot x = 2 \cot (2x)$ (c) $\tan 2x = \frac{2 \tan x}{1 - \tan^2 x}$
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Step 1: An identity is an equation that is true for all values of the variable, while an equation is a statement that is true only for certain values of the variable. Show more…
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