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OpenStudy (anonymous):
how do you solve 2 cos(x + 30) cos(x - 30) = 1 with restriction x E [-180, 180]?
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OpenStudy (ranga):
Use the identities cos(A+B) = cos(A)cos(B) - sin(A)sin(B) and cos(A-B) = cos(A)cos(B) + sin(A)sin(B) sin(30) = 1/2 cos(30) = sqrt(3)/2 Substitute and simplify
OpenStudy (anonymous):
thank you!
OpenStudy (ranga):
you are welcome.
OpenStudy (ranga):
What are you getting as a solution for x?
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