MCQ
The function $f : R \rightarrow R$ defined by $f(x) = 3 – 4x$ is:
- ✓Onto.
- BNot onto.
- CNone one$-$one.
- DNone one$-$onto.
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$\mathrm{f}(\mathrm{x})=\log _{\sqrt{5}}(3+\cos \left(\frac{3 \pi}{4}+\mathrm{x}\right)+\cos \left(\frac{\pi}{4}+\mathrm{x}\right)+\cos \left(\frac{\pi}{4}-\mathrm{x}\right)$
$-\cos \left(\frac{3 \pi}{4}-\mathrm{x}\right))$ is :