Contact us
Choose a category below so we can get back to you as quickly as possible.
cos2x-sin2x=cosx^2-sinx^2-2sinxcosx =(cosx-sinx)^2-2sinx^2 =(cosx+(-1+2^0.5)sinx)(cosx-(1+2^0.5)sinx)
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.