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  1. puremath

    Lesson How To Calculate pi

  2. puremath

    How Many Children?

    Harry had 4 daughters. Each daughter had a brother. How many children does Harry have?
  3. puremath

    Nostradamus Effect

  4. puremath

    Free Math Site or App For Geometric Shapes

    What's a good, FREE phone site or tool for drawing geometric shapes?
  5. puremath

    Practice Evaluate Trig Expressions 3

    Evaluate each expression given that f(x) = sin x g(x) = cos x h(x) = tan x k(x) = 2x Let d = delta A. h(k(pi/5)) B. h(1) + h(2) For A & B, use a calculator and round the final answer to one decimal place.
  6. puremath

    Practice Evaluate Trig Expressions 2

    Evaluate each expression given that f(x) = sin x g(x) = cos x h(x) = tan x k(x) = 2x Let d = delta A. df/dx on [pi/4, pi/2] B. dh/dx on [pi/4, 1.58] For B, use a calculator and round the final answer to one decimal place.
  7. puremath

    Practice Evaluate Trig Expressions 1

    Evaluate each expression given that f(x) = sin x g(x) = cos x h(x) = tan x k(x) = 2x A. f(5pi/6 + pi/6) B. g[k(3pi/4)]
  8. puremath

    Practice Three Angles

    List three angles (in radian measure) that have a sine of -1/2.
  9. puremath

    Practice Evaluate Trigonometric Expressions

    Evaluate each trig expression given below. A. cos(150) B. sin(-4pi/3)
  10. puremath

    Practice Reference Angle

    Find the reference angle or reference number. NOTE: WHAT IS THE DIFFERENCE BETWEEN A REFERENCE ANGLE AND REFERENCE NUMBER? A. 60° B. -60° C. 5pi/4
  11. puremath

    Practice Trig Functions of Theta 2

    Let P(x, y) denote the point where the terminal side of angle theta (in standard position) meets the unit circle. Use the given information to evaluate the six trigonometric functions of theta. A. x = -7/25 and 180° < theta < 270° B. x = -1/2 and 90° < theta < 180°
  12. puremath

    Practice Trig Functions of Theta 1

    Let P(x, y) denote the point where the terminal side of angle theta (in standard position) meets the unit circle. Use the given information to evaluate the six trigonometric functions of theta. A. x = -8/15 and pi < theta < (3pi)/2 B. y = 2/9 and 0 < theta < pi/2
  13. puremath

    Practice Approximate Trig Values 3

    Approximate the given trigonometric values to within successive tenths. Then use a calculator to compute the values to the nearest hundredth. A. sin 80° and sin(-80°) B. sin(2 + 2pi)
  14. puremath

    Practice Approximate Trig Values 2

    Approximate the given trigonometric values to within successive tenths. Then use a calculator to compute the values to the nearest hundredth. cos(-2) and sin(-2)
  15. puremath

    Practice Approximate Trig Values 1

    Approximate the given trigonometric values to within successive tenths. Then use a calculator to compute the values to the nearest hundredth. cos 2 and sin 2
  16. puremath

    Practice Larger Trig Quantity 2

    Determine which quantity is larger without a calculator and then use the calculator to check your answer. (tan 4)(tan 5) or (tan 5)(tan 6)
  17. puremath

    Practice Larger Trig Quantity 1

    Determine which quantity is larger without a calculator and then use the calculator to check your answer. sin 2 or sin 3
  18. puremath

    MY THOUGHTS ON COVID-19

    MY THOUGHTS ON THE VIRUS 1. I would be very careful to draw the conclusion that God allowed COVID-19 to create havoc and perdition. Humans are responsible for their own actions. 2. Let us not put God into our equation. He is not x, y, or z. 3. I see a lot of people on you tube trying to...
  19. puremath

    I've Been to Calvary

  20. puremath

    Math Beyond Grade 10

    I spend more time studying math beyond grade 10 that I often find myself forgetting arithmetic reasoning and basic algebra (algebra 1 & 2), for example. Is this normal? Can you relate?
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