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Cos^2x=(1-sinX)(1+sinX)

 Aug 20, 2015

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 #1
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Hallo anonymous!

 

That is the trigonometric Pythagoras

 

sin²x + cos²x = 1

cos²x = 1 - sin²x        →           3. binomial theorem

cos²x = (1 - sinx) * (1 + sinx)

 

Greetings asinus  :- )

 Aug 20, 2015
 #1
avatar+8943 
+5
Best Answer

Hallo anonymous!

 

That is the trigonometric Pythagoras

 

sin²x + cos²x = 1

cos²x = 1 - sin²x        →           3. binomial theorem

cos²x = (1 - sinx) * (1 + sinx)

 

Greetings asinus  :- )

asinus Aug 20, 2015

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