- #1
Googl
- 111
- 1
Hi all,
I have an exam today but the questions which will come up I have never come across before. Some of the questions involve the Factor Formulae which I have never seen before so I was wondering whether you might give some examples and perhaps links to other pages where I can take a long revision.
1. Using the factor formulae evaluate the integrals of the type (sinx cos3x)dx
2. Use the factor formulae to prove trig identities.
I have a general understanding of Trigonometry and I have just completed my Calculus.
We've just been told today about this exam and I have no idea how the factor formulae looks like and how to use it.
Thanks.
For prove trig using the Factor formulae:
Prove that: 4(cosx + cos2x)sin3xsinx = cos4x - cos8x
My take:
=2(cosx + cos2x) 2sin3xsinx
Reverse using factor formulae
=2(cosx + cos2x)(cos4x - cos2x)
I have an exam today but the questions which will come up I have never come across before. Some of the questions involve the Factor Formulae which I have never seen before so I was wondering whether you might give some examples and perhaps links to other pages where I can take a long revision.
1. Using the factor formulae evaluate the integrals of the type (sinx cos3x)dx
2. Use the factor formulae to prove trig identities.
I have a general understanding of Trigonometry and I have just completed my Calculus.
We've just been told today about this exam and I have no idea how the factor formulae looks like and how to use it.
Thanks.
Homework Statement
Homework Equations
The Attempt at a Solution
For prove trig using the Factor formulae:
Prove that: 4(cosx + cos2x)sin3xsinx = cos4x - cos8x
My take:
=2(cosx + cos2x) 2sin3xsinx
Reverse using factor formulae
=2(cosx + cos2x)(cos4x - cos2x)