#int (1-cos 3x)/(1-cos x)# ?

Answer 1

# sin2x+4sinx+3x+C#.

Since, #cos3x-1=(4cos^3x-3cosx)-1#, we find that,
#cos3x-1# is a cubic polynomial in #cosx#, and noting that the sum
of its co-efficients being #0, (cosx-1)# is a factor.
Thus, #cos3x-1=4cos^3x-3cosx-1#,
#=ul(4cos^3x-4cos^2x)+ul(4cos^2x-4cosx)+ul(cosx-1)#,
#=4cos^2x(cosx-1)+4cosx(cosx-1)+1(cosx-1)#,
#=(cosx-1)(4cos^2x+4cosx+1)#
#=(cosx-1){2(1+cos2x)+4cosx+1}#,
#:. (cos3x-1)=(cosx-1)(2cos2x+4cosx+3)#.
# rArr (cos3x-1)/(cosx-1)=(2cos2x+4cosx+3)#.
#:. int(1-cos3x)/(1-cosx)dx=int(cos3x-1)/(cosx-1)dx#,
#=int(2cos2x+4cosx+3)dx#,
#=2*(sin2x)/2+4sinx+3x#.
# rArr int(1-cos3x)/(1-cosx)dx=sin2x+4sinx+3x+C#.

Feel the Joy of Maths.!

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer 2

The expression you provided is in the form of a trigonometric function. Using the trigonometric identity (1 - \cos^2(\theta) = \sin^2(\theta)), the expression simplifies to ( \frac{\sin^2(3x)}{\sin^2(x)} ).

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Not the question you need?

Drag image here or click to upload

Or press Ctrl + V to paste
Answer Background
HIX Tutor
Solve ANY homework problem with a smart AI
  • 98% accuracy study help
  • Covers math, physics, chemistry, biology, and more
  • Step-by-step, in-depth guides
  • Readily available 24/7