MCQ
The value of `cos(pi/4 + x) - cos(pi/4 - x)` is ______.
- A`sqrt(2) sin x`
- ✓`- sqrt(2) sin x`
- C`- sqrt(2) cos x`
- D`sqrt(2) cos x`
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
i. The colour of colloidal dispersion depends on size of colloidal particles.
ii. Tyndall effect is used to distinguish between colloidal dispersion and true solution.
iii. Eosin and congo red are examples of negatively charged sols.