Question

sin^4 L-cos^4L+2cos^2L

Answer 1

Держи.............ю.....

Answer 2

спасибо большое))

Answer 3

sin⁴@-cos⁴@+2cos²@=(sin²@+cos²@)(sin²@-cos²@)+2cos²@=sin²@-cos²@+2cos²@=sin²@+cos²@=1