Question

pi/5 - pi/2

Answer 1

take pi common and you have pi(1/5-1/2) =pi(2-5)/10=-3pi/10

Answer 2

well I have the answer already, but I wanted to know how to get there, the answer says 3pi/5

Answer 3

so would I just simplify?

Answer 4

Can you post me the question ??> because what i answer is correct for the question you gave

Answer 5

yes. sorry. its Trig. i have to simplify the equation.
\[2 \cos ^{2}(\frac{ \pi }{ 5 }-\frac{ \pi }{ 2 }) -1\]
I think its because of the 2(3pi/5)?

Answer 6

so the identity gives me \[\cos 2(\frac{ \pi }{ 5 }-\frac{ \pi }{ 2 })\]

Answer 7

hmmm yes it is correct and you got the value of (pi/5-pi/2)

Answer 8

and cos(-theta)=cos (theta)

Answer 9

darnit! see these identities are so tricky!
ok so then it becomes what? if only pi/2 is negative?

Answer 10

i cant get you last question @theee_queenbee

Answer 11

@theee_queenbee check the attachment

Answer 12

yes thank you so much I understand this problem. the only thing I dont understand is what happened with the denom. did you divide the 2 by 10 to get 5 as the denom? I understand everything else

Answer 13

yes 2(x/2)=x we used this formula @theee_queenbee

Answer 14

ohhhhhhhhhhhhhhhhh ok thanks so much!! I appreciate your help!!!! :)