|cos 30| & |cos 330| | Mathematics | Page 1

blazing stirrupBOT Jun 11, 2023, 1:09 AM

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zenith wren Jun 11, 2023, 1:27 AM

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look at the unit circle

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what values do u get ?

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no

zenith wren Jun 11, 2023, 1:34 AM

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zenith wren what values do u get ?

^^

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right

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what does | | do ?

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ok so what do u get ?

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visualize i guess ?

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well it would need to be |cos10|=|cos350|

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bc its 360 degrees

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a circle

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right ?

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and u do -10 to the 360 to get 350

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therefore, the cos will be the same if u do +10 or -10 (with absolute value obv)

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for cos yeah

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like try to find

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cos70

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whats |cos70|=|cos (x)|

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find what x would be

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bruh

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obv cos 70=cos 70

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why ?

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why ?

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i said 360-10 on the previous example

zenith wren Jun 11, 2023, 1:40 AM

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zenith wren and u do -10 to the 360 to get 350

^

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how so ?

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u just need to do 360-70

robust nacelle Jun 11, 2023, 1:53 AM

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what is this person asking

zenith wren Jun 11, 2023, 1:54 AM

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robust nacelle what is this person asking

why those 2 are equal

robust nacelle Jun 11, 2023, 1:54 AM

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oh

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thats easy

zenith wren Jun 11, 2023, 1:55 AM

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well he doesnt get it

robust nacelle Jun 11, 2023, 1:55 AM

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first on the unit circle what is cos defined as?

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In (x,y)

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the x value

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the distance from the x axis

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since 30 is 30 degrees away from the x axis , its cos(30)

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and since 330 is 30 degrees from the x axis (360-30) it is equivalent

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the gap of 30 degrees between 330 and 360 is called the reference angle, from the coterminal side of the angle and the x axis

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however, these would be equal regardless if these had absolute value signs

#|cos 30| & |cos 330|