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Arieli
@Arieli
August 2022
1
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Найдите cos a, если sin a = -√3/2 и а принадлежит (π; 1,5π)
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zahargm808
Cos²a+sin²a=1
cos²a+3/4=1
cos²a=1/4
cos²a=1/2=0.5
a[π;1.5π] = [180°;270°]
cos240°=-0.5
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Answers & Comments
cos²a+3/4=1
cos²a=1/4
cos²a=1/2=0.5
a[π;1.5π] = [180°;270°]
cos240°=-0.5