Trigonometric integration question

In summary, the problem is to integrate sin^2x cos^4x and various strategies were attempted such as using the sin2x formula, letting u=sinx or u=cosx, and recalling that [sin(x)]^2[cos(x)]^4 can be simplified to (2+cos(2x)-2cos(4x)-cos(6x))/32 or (A+B cos(2x)+C cos(4x)+D cos(6x))/32 for certain numbers A,B,C,D. The options of integrating by parts or using trigonometric reduction formula were also considered. Eventually, the problem was successfully solved.
  • #1
turutk
15
0

Homework Statement



[tex]\int sin^2x cos^4x dx[/tex]

Homework Equations





The Attempt at a Solution



tried:
sin2x formula
writing 1-cos^2 instead of sin^2x
letting u=sinx
letting u=cosx

no luck yet
 
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  • #3
lurflurf said:
recall that
[sin(x)]^2[cos(x)]^4=(2+cos(2x)-2cos(4x)-cos(6x))/32
or recall that
[sin(x)]^2[cos(x)]^4=(A+B cos(2x)+C cos(4x)+D cos(6x))/32
for some numbers A,B,C,D and deduce such numbers
or integrate by parts
or make us of trigonometric reduction formula

thank you for your answer. this question seems to be too long but i managed to solve it.
 

FAQ: Trigonometric integration question

What is trigonometric integration?

Trigonometric integration is the process of finding the integral of a trigonometric function, which involves finding the area under the curve of the function. This is commonly used in calculus and can be solved using various techniques such as substitution, integration by parts, and trigonometric identities.

Why is trigonometric integration important?

Trigonometric integration is important because it allows us to solve real-world problems involving trigonometric functions. It is also a fundamental concept in calculus and is used in many other areas of mathematics and science.

What are the basic trigonometric integration rules?

The basic trigonometric integration rules include the power rule, product rule, quotient rule, and chain rule. These rules are used to integrate functions involving trigonometric functions such as sine, cosine, and tangent.

How do you solve a trigonometric integration question?

To solve a trigonometric integration question, you must first identify the type of trigonometric function involved and then choose an appropriate integration technique. This could include substitution, integration by parts, or using trigonometric identities. After applying the chosen technique, you can then evaluate the integral and simplify the solution.

What are some common applications of trigonometric integration?

Trigonometric integration has many applications in various fields such as physics, engineering, and economics. It is used to solve problems related to motion, waves, and oscillations, as well as in calculating areas and volumes of irregular shapes. Trigonometric integration is also used in determining the frequency and amplitude of periodic functions in signal processing and in finding the optimal solution in optimization problems.

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