I don't NEED an a* but would like one as it would enable me to get a grant if I got two other As.. unfortunately I got 80ums in C3 which means I have to get 100ums/full marks in C4 to get an A*!!! ermmm....
(I'm not re-taking C3 as I do French and there are no January A2 exams so everything rests on the summer ones...)
What's the workload like for French A2? possible to self teach? with AS?
You can rewrite the integrand as sin(x)^2 - sin(x)^4
sin(x)^2 integrates to: x/2 - sin(2x)/4 (+c)
sin(x)^4 integrates to: 3x/8 - sin(2x)/4 + sin(4x)/32 (+c)
You get this answer if you rewrite cos(x)^2 = 1 - sin(x)^2 in the first line. Of course you can rewrite the integrand in terms of cosine as well and get an answer that looks different, but should be equivalent mathematically
You can rewrite the integrand as sin(x)^2 - sin(x)^4
sin(x)^2 integrates to: x/2 - sin(2x)/4 (+c)
sin(x)^4 integrates to: 3x/8 - sin(2x)/4 + sin(4x)/32 (+c)
You get this answer if you rewrite cos(x)^2 = 1 - sin(x)^2 in the first line. Of course you can rewrite the integrand in terms of cosine as well and get an answer that looks different, but should be equivalent mathematically
sorry i lost you on the first part, what is it that you rewrote? and where did you get -sinx^4?