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Cos(A+B)Cos(A-B)

Find the doma...

Question

Find the domain of $\frac{1}{(\sqrt{c o s x) + c o s x}}$

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Solution

Domain of $\frac{1}{(\sqrt{c o s x) + c o s x}}$
$\sqrt{c o s x) + c o s x} \neq 0$
$| c o s x | + c o s x \neq 0$
$\Rightarrow c o s x > 0$

$D o m a i n = (- \frac{π}{2}, \frac{π}{2}) U (\frac{3 π}{2}, \frac{5 π}{2}) U$

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Cos(A+B)Cos(A-B)

Standard XII Mathematics

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