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help in wat
ana321
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use half angle formulas to rewrite \[\sqrt{1-\cos30 degrees/2}\]
dumbcow
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\[\sin (\theta/2) = \sqrt{(1-\cos \theta)/2}\]
ana321
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using that formula o but..
dumbcow
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so you can rewrite it as sin(15)
ana321
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hwo do i get there i cantsee
dumbcow
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??
ana321
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what i mean the answer of the problem i sin 15
how do i get there id ont understand
dumbcow
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theta = 30 so theta/2 = 30/2 = 15
ana321
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can u show that
dumbcow
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show what...prove that 30/2 = 15
ana321
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no the whole process
dumbcow
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well i looked up the half-angle identity for sin (theta/2)
**shown above**
it matches your expression except you have 30 degrees for the angle
ana321
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ok
,..?
ana321
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and
ana321
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ok
ana321
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nee help trig= rewrite this using half angle formula
sqrt{1= \cos 135 degress/2}\]
dumbcow
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is that a plus or minus ?
ana321
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sorry
let me rewrite it
ana321
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\[rewrtite using half aangle formulas \sqrt{1+ \cos 135 dgrees/2}\]
dumbcow
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plus means its the cosine half angle formula
take the given angle --> 135
divide it by 2 --> 135/2 = 67.5
answer = cos(67.5)
ana321
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so that my asnwer
my teacher doesn tlike decimals
dumbcow
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then write it as a fraction...the main thing is do you get the concept?
find appropriate formula , then take half the angle
ana321
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hello?
ana321
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can u show me thewhole process
and ow do is hwo it in fraction
ana321
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hello
ana321
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what wre u gonnaa say
dumbcow
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are you serious...i showed you step by step...there is no other process
you should have a reference in your book or notes showing the half-angle formulas
the fraction would simply be 135/2
http://www.freemathhelp.com/trig-double-angles.html
ana321
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need help trig rewrite using half angle idnetities =1-cos210 degress/sin210 degrees
ana321
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need help trig rewrite using half angle idnetities =1-cos210 degress/sin210 degrees
ana321
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heloo
dumbcow
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\[\rightarrow \frac{1-\cos 210}{\sin 210}\]
ana321
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yes i know the formula i dont know how to use it
dumbcow
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please don;t message me the same thing you are posting,
thanks
and this is different it isn't any of the half-angle formulas
ana321
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no yes
dumbcow
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\[\frac{1-\cos 210}{\sin 210} = \csc 210 - \cot 210\]
not sure how else to rewrite it unless you want to use sum/difference formulas
ana321
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ok tanks
ana321
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s o how do i ewrite using half angle idnetities =1-cos210 degress/sin210 degrees
ana321
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by just saying it equals to 1-cos theta/sin theta
ana321
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???
dumbcow
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umm i already answered you before regarding this question
ana321
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no i dont grasp it
dumbcow
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i don't think you can rewrite using half-angle formulas
look for yourself...see that the expression does not match any the formulas
ana321
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its what it says n my book
ana321
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yes it does tan theta /2
ana321
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hello
dumbcow
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yes i am wrong...my ref sheet has a different but equivalent formula for tangent
sorry...hey i learned something
anyway, now just take half the angle