katie6097
22.08.2019 •
Mathematics
Which of the following is equivalent to
2 cos²(x) - cos(2x) ?
a. sin(2x)
b. sin²(x)
c. 1
d. 2
Solved
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Ответ:
Option c ) 1
Step-by-step explanation:
[ Refer to the attachment ]
Sin²x + Cos²x = 1Cos²x = 1 - Sin²x
Cos2x = 1 - 2Sin²xОтвет:
4x + 48 = 180
subtract 48 from both sides
4x = 132
x = 33
and to check it we can do
33 + 3(33) + 48 = 180