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Sin^2 + ? = 1.

?=________

 Dec 18, 2014

Best Answer 

 #2
avatar+561 
+5

There's a trigonometric identity that this resembles.

1 = sin^2+cos^2

Basically, ? = cos^2

 Dec 18, 2014
 #1
avatar+118696 
+5

cos2x

 

You need to memorize this it is a very important identity 

 

sin2x+cos2x=1

.
 Dec 18, 2014
 #2
avatar+561 
+5
Best Answer

There's a trigonometric identity that this resembles.

1 = sin^2+cos^2

Basically, ? = cos^2

Will85237 Dec 18, 2014

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