Trig Question (1 Viewer)

[Shervin]

Prove
1 / 1 +[FONT=&quot]tan² [/FONT]x - 1 / 1 + [FONT=&quot]Sec² [/FONT]x = cos^{[FONT=&quot]4 [/FONT]}[FONT=&quot]x/ 1 + cos[/FONT][FONT=&quot]² [/FONT]x [FONT=&quot] [/FONT][FONT=&quot] [/FONT]^{[FONT=&quot][/FONT]}

 

[SoulSearcher]

Remember that 1+tan²x = sec²x, then simplify terms on the LHS until you get the RHS.