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sin ^ 2x-9cos ^ 2x Если cos = -0,9

 Feb 19, 2019

Best Answer 

 #1
avatar+103674 
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sin ^ 2x-9cos ^ 2x If cos = -0.9

 

\(find\;\;\;sin ^ 2x-9cos ^ 2x\;\;\;\;\; If \;\;\;\;cosx = -0.9\\~\\ sin ^ 2x-9cos ^ 2x\\ =sin ^ 2x-9cos ^ 2x+cos^2x-cos^2x\\ =(sin ^ 2x+cos^2x)-10cos ^ 2x\\ =1-10cos ^ 2x\\ =1-10*0.81\\ =1-8.1\\ =-7.1\)

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 Feb 19, 2019
 #1
avatar+103674 
+2
Best Answer

sin ^ 2x-9cos ^ 2x If cos = -0.9

 

\(find\;\;\;sin ^ 2x-9cos ^ 2x\;\;\;\;\; If \;\;\;\;cosx = -0.9\\~\\ sin ^ 2x-9cos ^ 2x\\ =sin ^ 2x-9cos ^ 2x+cos^2x-cos^2x\\ =(sin ^ 2x+cos^2x)-10cos ^ 2x\\ =1-10cos ^ 2x\\ =1-10*0.81\\ =1-8.1\\ =-7.1\)

Melody Feb 19, 2019

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