Really having problems.......

Question

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712

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Sorry for coming up with a valid proof for my own question last time...... I am really having problem this time.....

This is a trig question and I have already tried it three times and I can't solve this.

Here non-capital letter is a side and capital letter is an angle. And 'A' is opposite to 'a'.

Given a = 4, b = 5, c = 6. Prove that C = 2A

MaxWong Oct 2, 2016

Guest · Answer 1 · 2016-10-02T11:57:01

Using Law of Cosines, we have the following results:

Sides:
a = 4 m
b = 5 m
c = 6 m

Angles:
A = 41.4096°
B = 55.7711°
C = 82.8192° Therefore: C=2A. The naive Proof!!.