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C2 maths help watch

1. Prove that:
(tanx*sinx)/(1-cosx)=1+(1)/(cosx)
Many thanks
2. (Original post by orange8120)
Prove that:
(tanx*sinx)/(1-cosx)=1+(1)/(cosx)
Many thanks
Could you rewrite that please. The thing you wrote is not true.

The chances are that (at C2) you need to write tan as sin/cos and cancel and possibly a bit more depending on what you are trying to prove
3. (Original post by nerak99)
Could you rewrite that please. The thing you wrote is not true.

The chances are that (at C2) you need to write tan as sin/cos and cancel and possibly a bit more depending on what you are trying to prove
Are you sure?
4. Why not?
( sinx)^2=1-(cosx)^2=(1-cosx)*(1+cosx)

(Original post by nerak99)
Could you rewrite that please. The thing you wrote is not true.

The chances are that (at C2) you need to write tan as sin/cos and cancel and possibly a bit more depending on what you are trying to prove
5. Tanx * sin x --------1
---------------- = 1 + --------
1 - cosx. Cos x------cosx
Attached Images

6. (Original post by orange8120)
Prove that:
(tanx*sinx)/(1-cosx)=1+(1)/(cosx)
Many thanks
Hi. Some clues

1. Try rewriting tanx as sinx/cosx
2. Replace sin2x with 1 - cos2x
3. Factorise with difference of two squares
Spoiler:
Show
1. ((sinx/cosx)sinx) / (1 - cosx)

2. sin2x / ((cosx(1 - cosx))

3. (1 - cos2x) / (cosx(1 - cosx))

4. (1 - cosx)(1 + cosx) / (cosx(1-cosx))

5. (1 + cosx)/cosx

6. (1/cosx + cosx/cosx) => 1 + 1/cosx
7. No I am wrong, I substituted in pi/4 and did 1+root 2 on the RHS instead of 1+1/(root 2). Sorry OP

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