Recent content by kalistella

addition formulae - Trig help requested! I have a problem with this with regard to Sin 120 or Cos 120. Eg sin 165 sin (120 +45) sin120.cos45-cos120.sin45 How do I deal with sin 120 or cos 120? I know that cos 45 is 1/square root 2 and so is sin 45. But in the above problem, the...

Hi I need some help! Doing A'level logarithms and am stuck.:rolleyes: log3(x-1)=log8(x+1) So far, I have done these steps... (x-1)log3=(x+1)log8 xlog3-log3=xlog8+log8 xlog3-xlog8-log3-log8 Not sure what to do next to get the solution for x. Everything I do gets the wrong...

Sequences continued Hi Thanks for you help. How about when U0=4 U1=-1 Un - Un-1 - 2Un-2=0 I'm a little thrown by the U=0.:eek: Cheers!

Hi I have a problem with sequences and series. Can anybody help, please? The question is For the sequence U1, U2, U3, ...Un... the terms are related by Un = Un-1 +2Un-2 where n is greater or equal to 1, U1=2 and U2 =5. Find the values of U7, U11, and U14. Can someone...