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d/dx cscx = d/dx 1/sinx = d/dx (sinx)-1= -(sinx)-2 cosx

= -cosx/sin2x

= -1/sinx.cosx/sinx

= -cscx cotx

I suggest you copy this out onto paper so it is more clear. The / signs make it harder to see what is happening compared to horizontal divide lines.

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12y ago

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