cot70+4cos70=?


Question and Answers Forum

All Questions Topic List
None Questions
Previous in All Question Next in All Question
Previous in None Next in None
Question Number 192623 by sciencestudentW last updated on 23/May/23

$c o t 70 + 4 c o s 70 = ?$
	Answered by som(math1967) last updated on 23/May/23

	$t a n 20 + 4 s i n 20$ $= \frac{s i n 20 + 4 s i n 20 c o s 20}{c o s 20}$ $= \frac{s i n 20 + 2 s i n 40}{\cos 20}$ $= \frac{\sin 20 + \sin 40 + \sin 40}{c o s 20}$ $= \frac{2 s i n 30 c o s 10 + s i n 40}{c o s 20}$ $= \frac{s i n 80 + s i n 40}{c o s 20}$ $= \frac{2 s i n 60 c o s 20}{c o s 20}$ $= \sqrt{3}$
Terms of Service
Privacy Policy
Contact: info@tinkutara.com

Question and Answers Forum