sin+cos=0.8 Найдите sin²a×cos²a+2sina×cosa+1. Created by kapriznaya01. algebra-ru

sin+cos=0.8 Найдите sin²a×cos²a+2sina×cosa+1...

August 2022 1 0 Report

sin+cos=0.8
Найдите sin²a×cos²a+2sina×cosa+1

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sedinalana sina+cosa=0,8
(sina+cosa)²=0,64
sin²a+2sinacosa+cos²a=0,64
1+2sinacosa=0,64
2sinacosa=0,64-1
2sinacosa=-0,36
sinacosa=-0,18
sin²acos²a=0,0324
sin²a×cos²a+2sina×cosa+1=0,0324-0,36+1=0,6724

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