Posted by ricardogm on January 21st, 2019
Hi
We are going to prove these two famous trigonometic identities:
sin2(x) + cos2(x) = 1
tan(x)=cos(x)/sin(x)
that can be seen in this applet:

And how to measure trees with trigonometry (we are going to do more or less the same thing):

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This entry was posted on Monday, January 21st, 2019 at 9:50 and is filed under 4º ESO.
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