The law of cosines is a^2+b^2-2abcos(C). Find the value of 2abcos(C). A. 37
B. -40
C. 40
D. 20​

A. 37

Step-by-step explanation:

Given

The attached triangle and

Required

Find

From the attachment:

So, we have:

Collect like terms

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.

each side has a different length.  

step-by-step explanation: