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avatar+155 

help me, please.

 Nov 12, 2020
 #1
avatar+112375 
+2

First  blank  we have   1 /tan u   

 

And 1/ tan u  = 1 / (sin u / cos u)  =  cos u / sin u

 

So now we have 

 

cos u  * sec u  *  cos u  / sin u  =       cos u  * (1 /cos u)  *  (cos u /sin u) 

 

(The red part goes into the  second blank)

 

And this   evaluates to     cot u   .....which is what we are trying to show  !!!!

 

 

cool cool cool

 Nov 12, 2020
 #2
avatar+93 
+1

What is sec though? I know it stands for secant, but I don't know what it is...

Lol geometry is one of my worst subjects.

ETERNITY  Nov 12, 2020
 #3
avatar+112375 
+1

sec u    =  1 /cos u     

 

Sorry....I should have made that a  little  clearer   !!!

 

cool cool cool

CPhill  Nov 12, 2020
 #4
avatar+93 
+2

Oh okay... Guess I'm learning something new every day! angel

ETERNITY  Nov 12, 2020

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