#integration by sub

23 messages · Page 1 of 1 (latest)

plush pecan
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sin^3x = sinx * sin^2x

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and sin^2x is 1-cos^2x

fathom kestrel
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so why have they choesen to seperate to get "sin^3x = sinx * sin^2x"

fathom kestrel
plush pecan
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dyk this identity? sin^2x + cos^2x = 1

fathom kestrel
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ohh rightt

plush pecan
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yea

fathom kestrel
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so that line they just re wrote it

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why?

plush pecan
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which line

fathom kestrel
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the red one i have the arrow

plush pecan
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oh

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its cos you cant really do anything with sin^3x

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rewriting it gives us more things to play around with

fathom kestrel
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actually how did they get the second line

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from what i see they subsututed values (the 2nd highest line and the one below) but how did it remove the sinx

plush pecan
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are you actually year 9?

fathom kestrel
fathom kestrel
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im yr 13

plush pecan
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oh