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1. ### Help evaluating integral ∫(between pi and –pi/4 ) sin ø cos ø dø?

...the integeral of sin a da = cosa da +C Therefore the integeral of (1/4)(sin2a)(2da) = cos2a/4 +C Therefore the definate integral from pi to -pi...

4 Answers · Science & Mathematics · 29/11/2009

...4 - x^2)/x^2 dx Let x = 2 sin ø then dx = 2 cos ø 4 - x^2 = 4 - 4 sin^2 ø = 4(1 - sin^2 ø) = 4 cos^2 ø √(4...

2 Answers · Science & Mathematics · 28/03/2010

3. ### Doe the point (1, 8) form a parallelogram with the three red flags (-1,4 ), (1,1) and (3, 5)?

... Willie should be sneering from ear to ear as With (-1,4 ), (1,8), (1,1) and (3, 5) as the given vertices, From...

6 Answers · Science & Mathematics · 06/01/2009

4. ### Integration question?

... to me like trig sub. x = 2sinø dx = 2cosø √(4 - 4sin^2ø) * 2cosø √(4(1 - sin^2ø) * ...

3 Answers · Science & Mathematics · 04/09/2012

π/4 ∫ ( 3 + 2tan^2(ø) ) -π/4 π/4 ∫ ( 3 + 2 * (sec^2(ø) - 1) ) -π...π/4 (π/4 - -π/4) + 2 * ( tan(π/4) - tan(-π/4) ) (π/4 + π/4) + 2 * ( 1 - - tan(π/4) ) (2π/4) + 2 * ( 1 + 1 ) (π/2...

1 Answers · Science & Mathematics · 15/04/2012

6. ### integrate dx/sqrt(4+x^2),with interval a=0 and b=1?

...1} dx/√(4 + x^2) Let x = 2 tan ø then dx = 2 sec^2 ø  4 + x^2 = 4 + 4 tan^2 ø = 4(1 + tan^2 ø) = 4 sec^2 ø √(4...

2 Answers · Science & Mathematics · 04/02/2012

7. ### Evaluate the integral...?

...3 π/3 ∫ secØ tanØ = [secØ] = (1 / cosØ) from π/4 to π/3 π/4 π/4 = (1 / ( 1 / 2) ) - (1...

1 Answers · Science & Mathematics · 29/12/2012

8. ### Evaluate the integral. (top) pi/4 S -pi/4 tan(Ø^3) dØ?

tan^3 = sin^3 / cos^3...so let w = cos Θ to get to [w² -1 ] / w^3 dw to work

2 Answers · Science & Mathematics · 21/11/2010

9. ### Integral problem 10-6-2?

...8*√(1-sin^2ø) * √2cosødø ∫ √16 * cos^2ø 4 ∫ cos^2ø 4 ∫(1/2)(1+cos2ø) 2 ∫ 1...

1 Answers · Science & Mathematics · 09/03/2013

10. ### determine whether the geometric series converges?

This geometric series has initial term a = 1 and ratio r = -0.4 (this is by what we multiply one term to get the next term). Since |r...

1 Answers · Science & Mathematics · 21/12/2013