Question

if tan alpha+cot alpha=a then the value of tan^4 alpha+cot^4 alpha=
a)a^4+4a^2+2
b)a^4-4a^2+2
c)a^4-4a^2-2
d)none of these
with steps plssssss......

Answer 1

Answer:

b) a^4-4a^2+2 is correct option