Question

does anyone know how to do it​

Answer 1

((sin2@+cos2@)(sin2@-cos2@)+(sin2@+cos2@))

Answer 2

Sin^4@ - Cos^4 + 1

(Sin^2@+Cos^2@)(Sin^2@ - Cos^2@)+(Sin^2@+Cos^2@)

(Sin^2@+Cos^2@)(Sin^2@ - Cos^2@+1)

Sin^2@+Sin^2@

2Sin^2@