How to solve 2cos 150°-3sin 90° +tan 210°

Khaleesi Herbert 2020-10-27 Answered
How to solve 2cos150°3sin90°+tan210°
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Expert Answer

unessodopunsep
Answered 2020-10-28 Author has 105 answers
To find the related angles of given ones, and their (+) or (-) signs, use the unit circle.
cos150°=cos(180°30°)=cos30°=32(30°60°90°,or123),sin90°=1, and
tan210°=tan(180°+30°)=tan30°=13=33 (30°-60°-90° triangle)
The given equation is restated as follows:
2cos150°3sin90°+tan210°=2cos30°3sin90°+tan30°
=2323(1)+33=9+233 (= approx. -4.1547)
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