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# c3 trig question watch

1. cot2x+cosec2x=cotx... identity
2. What have we got to do?

Solve it? Prove it?

and what do you mean by 'cotx....identity' exactly?
3. (Original post by MrTrig)
What have we got to do?

Solve it? Prove it?

and what do you mean by 'cotx....identity' exactly?
sorry should have said / Prove it.
4. l.h.s = cot2x+cosec2x
=cos2x/sin2x + 1/sin2x
= (cos2x + 1)/sin2x
= (2cos^2 x -1+1)/2sinxcosx
= 2cos^2x/2cosxsinx
= cosx/sinx
= cotx = r.h.s

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