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. Find x
A.
⇒
(using cos(A-B) = cosAcosB + sinAsinB)
(The value of switches between 1 and -1)
Evaluate:
x<0
x>0
|x|≥1
2 If , then find the value of .
If and , then find x and y.
If , then find the values of x.
Solve:
Solve: .