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# Core 4 trigonometry watch

1. Prove tan2x + Cot2x can be written as 2cosec4x? Anyone !!!!

double angle formula used 😪
2. (Original post by plower)
Prove tan2x + Cot2x can be written as 2cosec4x? Anyone !!!!

double angle formula used 😪
Write it in terms of sin2x and cos2x, then use a common denominator to make it one term.
3. (Original post by NotNotBatman)
Write it in terms of sin2x and cos2x, then use a common denominator to make it one term.
I thought you do (2tanx/1-tanx^2) + (1-tanx^2/2tanx) first?
4. (Original post by plower)
I thought you do (2tanx/1-tanx^2) + (1-tanx^2/2tanx) first?
It doesn't really matter what you do, as long as you prove LHS = RHS, but it may be a bit harder doing it in terms of tan2x (not tanx).
5. (Original post by NotNotBatman)
Write it in terms of sin2x and cos2x, then use a common denominator to make it one term.
Ohh... so what like sin2x/cos2x + cos2x/sin2x?
6. (Original post by plower)
Ohh... so what like sin2x/cos2x + cos2x/sin2x?
Yes.
7. (Original post by NotNotBatman)
Yes.
Didn't know you could do that....... allright thanks, I'll try it!

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