Trigonometric identities

  • Purple crocuses in the snow.
    problem

    Polar Flower

    Age
    16 to 18
    Challenge level

    This polar equation is a quadratic. Plot the graph given by each factor to draw the flower.

  • What are Complex Numbers?
    article

    What Are Complex Numbers?

    This article introduces complex numbers, brings together into one bigger 'picture' some closely related elementary ideas like vectors and the exponential and trigonometric functions and their derivatives and proves that e^(i pi)= -1.
  • Round and round a circle
    interactivity

    Round and Round a Circle

    Age
    14 to 16
    Challenge level

    Can you explain what is happening and account for the values being displayed?

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