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  1. R

    Trigonometry and Integrals!

    I need help with a question and i'm totally stuck at this! My friends can't help me so you are my last way out! Prove ∫sin^n x dx= -(1/n)cos x sin^n-1 x + ((n-1)/n) ∫sin^n-2 x dx Thanks for your time! Sincerely :)
  2. R

    Please Help Have exam tomorrow waves

    Please Help Have exam tomorrow!!!! waves A jet is flying horizontally, as the drawing shows. When the plane is directly overhead at B, a person on the ground hears the sound coming from A in the drawing. The average temperature of the air is 20 °C. If the speed of the plane at A is 164 m/s...