Jawabanmu

2014-06-01T15:25:19+07:00
Ingat identitas trigonometri; sin^2 x + cos^2 x = 1. maka 1-sin^2 x = cos^2 x. dan sebaliknya.

(sin^2 x / cos^2 x) + ( cos^2 x/ sin^2 x)
= (sinx/cosx)^2 + ( cosx/sinx)^2
= (tanx)^2 + (cot x)^2
= tan^2 x + (1/tanx)^2
= (tan^4 x + 1)/ tan^2 x