Sin^4 L-cos^4L+2cos^2L

Question

Sin^4 L-cos^4L+2cos^2L

Answer 1

Держи.............ю.....

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Comments

спасибо большое))

Answer 2

Sin⁴@-cos⁴@+2cos²@=(sin²@+cos²@)(sin²@-cos²@)+2cos²@=sin²@-cos²@+2cos²@=sin²@+cos²@=1