ricesonice5
19.10.2019 •
Mathematics
1+cos(18x)=
a. 2cos^2(9x)
b. 2sin^2(9x)
c. 2cos^2(18x)
d.2sin^2(18x)
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Ответ:
A
Step-by-step explanation:
1 + cos(18x) becomes
1 + cos(9x + 9x)
1 + cos²(9x) - sin²(9x)
1 + cos²(9x) - (1 - cos²(9x))
1 + cos²(9x) - 1 + cos²(9x)
2 cos²(9x)
Ответ:
a 2cos^2 (9x)
Step-by-step explanation:
Ответ:
The equation has infinitely many solutions.
Step-by-step explanation:
First, apply the distributive property to eliminate the parentheses
Next, combine like terms on each side of the equation
Finally, use the properties of equality to isolate x
Because the variable terms cancel out, leaving the same number on both sides of the equal sign, the equation has infinitely many solutions.