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# Pearson Edexcel C1/2 Question Watch

1. Show that (cos^2x-sin^2x)/(1-sin^2x) = 1-Tan^2x
I have no idea its a 2 mark question so it should be simple.
I got to (1-2sin^2x)/(cos^2x) and dont know what to do next.
2. (Original post by Tom22561)
Show that (cos^2x-sin^2x)/(1-sin^2x) = 1-Tan^2x
I have no idea its a 2 mark question so it should be simple.
I got to (1-2sin^2x)/(cos^2x) and dont know what to do next.
Denominator :

3. (Original post by notnek)
Denominator :

1-2sin^2x divided by cos^2x and what to do next?
4. (Original post by Tom22561)
Show that (cos^2x-sin^2x)/(1-sin^2x) = 1-Tan^2x
I have no idea its a 2 mark question so it should be simple.
I got to (1-2sin^2x)/(cos^2x) and dont know what to do next.
Leave the numerstor as it is:

(cos^2 x - sin^2 x) / cos^2 x = (cos^2 x)/cos ^2 x - (sin^2 x)/cos ^2 x = ...

Edit: too late, dammit phone!
5. (Original post by Zacken)
Leave the numerstor as it is:

(cos^2 x - sin^2 x) / cos^2 x = (cos^2 x)/cos ^2 x - (sin^2 x)/cos ^2 x = ...

Edit: too late, dammit phone!

Thank you soo much i knew it was something simple
6. (Original post by Zacken)
Leave the numerstor as it is:

(cos^2 x - sin^2 x) / cos^2 x = (cos^2 x)/cos ^2 x - (sin^2 x)/cos ^2 x = ...

Edit: too late, dammit phone!
Your posts just don't look right without LaTeX

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