vhife4901
28.03.2020 •
Mathematics
Please help me
If 180°<α<270°, cos α=−8/17, what is sin -α?
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Ответ:
15/17
Step-by-step explanation:
opposite² = 17² - 8²
opposite² = 225
opposite = 15
sin a = - 15/17
(sin is -ve in the third quadrant)
sin(-X) = -sinX
sin(-a) = -sin(a)
= -(-15/17)
= 15/17
Ответ: