- #1

sp3

- 8

- 0

in order to find cos(x)

^{3}- sin

^{3}(x) = ?

i tried to slove for sin(x) using sin

^{2}+ cos

^{2}=1 replacing cos(x) by the first equation and i end up with a second degree polynomial using x = sin(x) and there are 2 solutions, it seems off...

btw i used the (a+b)

^{2}identity for (sin(x) + 1/\(\displaystyle \sqrt{3}\))

^{2}

if anyone could help me i thank you in advance!