Apparently, this user prefers to keep an air of mystery about them.
2 Prove the following trigonometric identity. dec 12 '13
0 solving a trig identities using formula $x^4+y^4$ but there is also a -1 what can i solve it dec 8 '13
0 solving this equation $\sin x-\cos x=1/\sqrt2$ mar 4 '14