Problem 140 of 7
Correct the complementary-angle trig error: A student thinks the cofunction of sin(theta) is tan(90-theta).
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
catch wrong complement, swapped function, and degree arithmetic mistakes.
Hidden until you reveal it.
Correction must address wrong complement, swapped function, or degree arithmetic.
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Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify the angle inside the trig function.
2. Compute the 90-degree complement.
3. Rewrite or solve using the cofunction rule.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using supplementary angles for right-triangle cofunctions.