Question

21. If x = a (cosec 0 + cot O) and y= b (cot 0 - cosec O),
then
(a) xy = ab = 0 ✓(b) xy + ab = 0
(c) * +? = 1
(d) x2 y2 = ab
a
C​

Answer 1

Answer:

b

Step-by-step explanation:

Given,

x = a (cosec 0 + cot O) and y= b (cot 0 - cosec O)

multiplying the above two equations, we get

xy = ab [ cot ^2 (0) - cosec ^2 (0) ]

=> xy = ab ( -1 ) [ since cosec ^2 α - cot ^2 α = 1 )

=> xy + ab = 0