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avatar+1690 

 

i tried working it out but im not sure? can someone help explain ? thank you!

 Mar 4, 2020
 #1
avatar+109499 
+3

Notice that   

 

cos-1  (- √2/2)  asks  the  question.....where does  the cosine = -√2/2  ???

 

This is at    3pi/4  

 

So    sin  (cos-1(-√2/2))    = sin  (3pi/4)     =    √2/2

 

And  notice that   sin (pi/2)  = 1

 

So  tan-1  (1)   asks the question......where  does  the tan  =  1 ???

 

This is   at   pi/4 

 

So....puuting  this altogether  we  have

 

√2/2  +  pi/4  =

 

2√2  +  pi

________

      4

 

 

cool cool cool

 Mar 4, 2020
 #2
avatar+1690 
+1

Yes! I understand this, i remember covering this! thank you so much for your explanation it has helped!

jjennylove  Mar 4, 2020

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