1. ## trigo proving.....

sin^6 -cos^6 = (2sin^2 -1)(1-sin^2+sin^4)
help me prove this question pls..
tq

2. Originally Posted by teckyuan
sin^6 -cos^6 = (2sin^2 -1)(1-sin^2+sin^4)
help me prove this question pls..
tq
Start by noting that $\displaystyle \sin^6 x - \cos^6 x = \left( \sin^2 x\right)^3 - \left( \cos^2 x\right)^3$ and use the difference of two cubes formula.