27. The value of (cos 330° + sin 660° +
sin 150° cos 120°) is:
Answers
Answered by
2
Answer:
(cos330 +sin660+sin150cos120)
=cos(360-30)+sin(2*360-60)+sin(180-30)cos(90+30)
=cos30 -sin60+sin30(-sin30)
=√3/2-√3/2-(1/2)^2
=-1/4
Answered by
0
Answer:
1/4
Step-by-step explanation
You can also go to Symbolab trig calculator
and it will do what I just did for you on my scientific calculator with steps involved
(cos330 +sin660+sin150cos120)
=cos(360-30)+sin(2*360-60)+sin(180-30)cos(90+30)
=cos30 -sin60+sin30(-sin30)
=√3/2-√3/2-(1/2)^2
=-1/4
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