Delete
Share
This Question is Closed
ajprincess
Best Response
You've already chosen the best response.
2
\[\theta=\cos^{-1}\frac{-\sqrt3}{2}\]
\[\cos\theta=\frac{-\sqrt3}{2}\]
So vat is the value of \(\theta\)? @msingh
ajprincess
Best Response
You've already chosen the best response.
2
cos60=1/2
ajprincess
Best Response
You've already chosen the best response.
2
well ya. but there is another value.
msingh
Best Response
You've already chosen the best response.
0
-cos30
apple_pi
Best Response
You've already chosen the best response.
1
why do you need to find theta?
It's just cos(A+B)
ajprincess
Best Response
You've already chosen the best response.
2
hw abt 5pi/6?
ajprincess
Best Response
You've already chosen the best response.
2
i mean cos(5pi/6)
msingh
Best Response
You've already chosen the best response.
0
okay
ajprincess
Best Response
You've already chosen the best response.
2
\[\cos(\frac{5\pi}{6}+\frac{\pi}{4})=?\]
ajprincess
Best Response
You've already chosen the best response.
2
nw as @apple_pi mentioned u can use \(\cos(A+B)=\cos A\cos B-\sin A\sin B\).
apple_pi
Best Response
You've already chosen the best response.
1
@ajprincess why did you find theta?
You could just leave it as acos(...),
then cos(acos(...)) would cancel and
then use pythagorus to find sin(acos(...))
ajprincess
Best Response
You've already chosen the best response.
2
well i found it easy to find theta first nd then do..:)
apple_pi
Best Response
You've already chosen the best response.
1
ok whatever suits you :p
msingh
Best Response
You've already chosen the best response.
0
@ajprincess
can u plse tell me exact answer
ajprincess
Best Response
You've already chosen the best response.
2
Well i am really sorry. I am nt supposed to give direct answers. pls check the code of conduct
ajprincess
Best Response
You've already chosen the best response.
2
|dw:1367584877456:dw|
ajprincess
Best Response
You've already chosen the best response.
2
plug in the values nd simplify
msingh
Best Response
You've already chosen the best response.
0
yes, after this, i m getting
cos(5pi/6)-sin(5pi/6)
ajprincess
Best Response
You've already chosen the best response.
2
what is cos(pi/4)?
msingh
Best Response
You've already chosen the best response.
0
oh again i did wroong
i place 1 as it is 1/ root2
ajprincess
Best Response
You've already chosen the best response.
2
what are cos(5pi/6),sin(pi/4) and sin(5pi/6)?
msingh
Best Response
You've already chosen the best response.
0
-root3/2
1/root2
root3/2
ajprincess
Best Response
You've already chosen the best response.
2
first two values are right. chck the last one
msingh
Best Response
You've already chosen the best response.
0
- root 3/2
ajprincess
Best Response
You've already chosen the best response.
2
nope. sin150=1/2.
msingh
Best Response
You've already chosen the best response.
0
okay
ajprincess
Best Response
You've already chosen the best response.
2
150=5pi/6
ajprincess
Best Response
You've already chosen the best response.
2
nw plug in those values and simplify
msingh
Best Response
You've already chosen the best response.
0
okay
msingh
Best Response
You've already chosen the best response.
0
i got
(1/2root2)*(-root3-1)
ajprincess
Best Response
You've already chosen the best response.
2
yup right:)
msingh
Best Response
You've already chosen the best response.
0
@ajprincess
thank you
ajprincess
Best Response
You've already chosen the best response.
2
welcome:)