Evaluate without using tables sin(-1290º)
a
\(\frac{3}{2}\)
b
-\(\frac{3}{2}\)
c
\(\frac{2}{2}\)
d
1
e
\(\frac{1}{2}\)
Explanation
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Discussions (6)
biggwati
10 months ago
Sin (-1290°) = Sin -1290 +(360 ×4)
= Sin 150°
150° is in d second quadrant and the reference angle is 180°.
So, 180° - 150° = 30°.
Since Sin 30° = 1/2.
=> Sin 150° = Sin 30° = 1/2.
=> Sin(-1290) = Sin 150° = 1/2
Divinescholar43
2 years ago
My answer was correct but all the options were marked wrong, in the explanation the answer I choose was the answer in the explanation
