To solve the equation cos(x/2) - sin(x/2) = √2/2, we can apply the half-angle identities for sine and cosine.
Recall that the half-angle identities are:
cos(x/2) = ±√((1 + cos(x))/2)sin(x/2) = ±√((1 - cos(x))/2)
Substitute these identities into the equation:
±√((1 + cos(x))/2) - ±√((1 - cos(x))/2) = √2/2
We can simplify this equation by squaring both sides to eliminate the square roots:
(1 + cos(x))/2 - 2√((1 + cos(x))(1 - cos(x))/4) + (1 - cos(x))/2 = 2/4
Multiplying all terms by 4 to clear the denominators:
2(1 + cos(x)) - 4√((1 - cos^2(x))/4) + 2(1 - cos(x)) = 2
Simplify further:
2 + 2cos(x) - 4√(sin^2(x)/4) = 2
2 + 2cos(x) - 2|sin(x)| = 2
2cos(x) - 2|sin(x)| = 0
cos(x) - |sin(x)| = 0
From here, we can solve for x by considering different intervals where sin(x) is positive or negative. The solution may involve multiple solutions due to the absolute value function.
To solve the equation cos(x/2) - sin(x/2) = √2/2, we can apply the half-angle identities for sine and cosine.
Recall that the half-angle identities are:
cos(x/2) = ±√((1 + cos(x))/2)
sin(x/2) = ±√((1 - cos(x))/2)
Substitute these identities into the equation:
±√((1 + cos(x))/2) - ±√((1 - cos(x))/2) = √2/2
We can simplify this equation by squaring both sides to eliminate the square roots:
(1 + cos(x))/2 - 2√((1 + cos(x))(1 - cos(x))/4) + (1 - cos(x))/2 = 2/4
Multiplying all terms by 4 to clear the denominators:
2(1 + cos(x)) - 4√((1 - cos^2(x))/4) + 2(1 - cos(x)) = 2
Simplify further:
2 + 2cos(x) - 4√(sin^2(x)/4) = 2
2 + 2cos(x) - 2|sin(x)| = 2
2cos(x) - 2|sin(x)| = 0
cos(x) - |sin(x)| = 0
From here, we can solve for x by considering different intervals where sin(x) is positive or negative. The solution may involve multiple solutions due to the absolute value function.