Question

Find the envelope of circles described on the radii vectors of the following curve as diameter:
l/r = 1 + e cos @

Answer 1

Step-by-step explanation:

Indicators are those substances which tell us whether a substance is acidic or basic by change in colour. For e.g., litmus solution.

• Olfactory indicators: Those substances whose odour changes in acidic or basic media are called lfactory indicators. For e.g., clove, vanilla, onion.