cosx*sin(π-x)-sinx*cos(π+x) = 1
cosx*(sinπ*cosx-sinx*cosπ)-sinx*(cosπ*cosx-sinπ*sinx) = 1
cosx*(0-(-sinx))-sinx*(-cosx-0) = 1
cosx*sinx + sinx*cosx = 1
2sinx*cosx = 1
sin2x = 1 € [-1,1]
rezolvam ecuatia trigonometrica
2x € {(-1)^k + arcsin1 + kπ | k€Z}
2x € {(-1)^k+ π/2 + kπ | k€Z}
x € {(-1)^k + π/4 + kπ | k€Z}
