Question

CURVE TRACING 5-21
OBJECTIVE TYPE QUESTIONS
1. If the equation of a curve remains unchanged when x and y are interchanged, then the curve is
symmetrical about
(b) y = -x
(c) origin
(a) y = x
(d) none.
[Ans. (a)
201​

Answer 1

Answer:

tan 0 + cot 0 = 2

Squaring both sides;

(tan 0 cot 0)² = 2²

tan²0+ cot²0+2 tan 0 cot 0 = 4

tan²0+ cot²0+2=4

tan²0+ cot² 0 = 2