#trig identites , hidden quadratic

45 messages · Page 1 of 1 (latest)

vestal cargo
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basically -18.03

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yu takeaway from 180 to get 2nd value

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basically 180--18.03

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gives you 198.03

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round up gives yu 198

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ibr idk how ot explain it well

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but ik what to do 😭

ivory oak
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sin graph repeats

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every 360

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thats where 342 comes from

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and then

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sin(180-theta) = sin(theta)

vestal cargo
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yhyh thats it

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360-18.03

ivory oak
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just memorise it

vestal cargo
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gives yu 341.97

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so baso 392

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its either right

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392 OR 198

ivory oak
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the range is between 0 and 360

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its actually 360 + -18.03
but thats 360-18.03

vestal cargo
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mhm

ivory oak
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sin graph repeats every 360 degrees

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so if your at one point and shift by 360 degrees you end up at the same point

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uh

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do you know what a cast diagram is

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yh so imagine like

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so like

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C means only cos is positive

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A means all

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S means only sine

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T means only tan

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i drew some angle alpha in blue

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180 - alpha in red

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and sin is the vertical side

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and its in the quadrant where sine is positive

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so
sin(alpha) = sin(180-alpha)
measure the angle anticlockwise

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imagine cos

cos is the horizontal line of that triangle

cos is negative in that quadrant where sine is only positive
so

cos(180-alpha) = -cos(alpha)

scenic cipher
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,w 180- -18.03

desert pikeBOT
scenic cipher
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,w -18.03 + 360

desert pikeBOT
scenic cipher
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@pseudo ivy

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Search up dr frost a level trig equations on yt