Question

Write sin(5theta) in terms of sin(theta) and cos(theta)

Answer 1

sketch the graph?

Answer 2

have to solve in terms of sin(theta) and cos(theta) and also using the double angle stuff....

Answer 3

I don't understand the question, it's not enough condition to do something but graph

Answer 4

Sorry, I was not specifying: Write sin(5theta) in terms of sin(theta) and cos(theta)

Answer 5

it's a long long story. but I can give you some formula, you can do it by yourself:
sin (5theta) = sin (4theta + theta) = sin (4theta) cos (theta) + cos (4theta) sin (theta)
and then, sin(4theta) = sin (2theta + 2 theta), the same process to replace sin(4theta) in terms of sin(theta).

Answer 6

cos (4theta)= cos(2theta +2theta)= cos^2(2theta)+ sin^2(2theta)

Answer 7

You can look up the Sum and Difference Formulas andv Product to Sum Formulas to understand where they come from too

Answer 8

and then, cos^(2theta)= (2cos^29theta)-1)^2. oh my god. I lost

Answer 9

ye, jotopia34 is right.

Answer 10

everything has formula, what you need is being patient

Answer 11

i usually get to cos 4(theta) then stuff gets really confusing
each time i try, a different answer seems to pop up :/

Answer 12

try again

Answer 13

The biggest problem is that I dont know what the right answer is so i dont know when to stop.

Answer 14

stop at sin and cos(theta) only, not sin or cos (2or 4theta)

Answer 15

you can have sin^2 (theta) or cos^2(theta) , just 1theta.

Answer 16

oh ok thanks mate

Answer 17

yw