Back to the studio New seed 4 problems · seed S2GBTFWEMJ6MQJV9ECTM20Z110

True or False?

A real identity — half of them subtly broken. You guess; the verdict is checked, not assumed.

Randomly
equations.identity
Name Class Date
  1. 1.
    ln(1/a) = -exp(a)
  2. 2.
    1 + tan(x)^2 = 1/sin(x)^2
  3. 3.
    cos(2x) = cos(x)^2 - sin(x)^3
  4. 4.
    sin(2x) = 2sin(x)sin(x)

Answer key

True or False? — seed S2GBTFWEMJ6MQJV9ECTM20Z110

Randomly
equations.identity
  1. 1. False — a ln became a exp; it should read ln(1/a) = -ln(a)
  2. 2. False — a cos became a sin; it should read 1 + tan(x)^2 = 1/cos(x)^2
  3. 3. False — the coefficient 2 became 3; it should read cos(2x) = cos(x)^2 - sin(x)^2
  4. 4. False — a cos became a sin; it should read sin(2x) = 2sin(x)cos(x)