Categories
Exact Values of Trig Functions Trigonometric Functions

If sin(x)/cos(x) = 3/5, then 1/cos(x) = 1/5.

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The submitter asks: What would you write as feedback here? What would actually help this kid?

I ask: What’s the role of written feedback, more generally?

(Thanks again, Tina!)

Categories
Exact Values of Trig Functions Trigonometric Functions

cos[arctan(5/7)]…

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What’s up with this cool work?

via Tina

Categories
Exact Values of Trig Functions Trigonometric Functions

The Fundamental Mistake of Trigonometry

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Categories
Exact Values of Trig Functions Trigonometric Functions

sin(75) = …

precalc 21 2 precalc 21 3 precalc 21

 

What do these responses reveal about what the students know about trig? Or just comment about what you find interesting here.

Thanks to the Incredible Tina Cardone for the submissions.