SOLUTION: Solve the following algebraically for 0˚ ≤ x < 360˚: cos x = cos 2x
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Question 1138003: Solve the following algebraically for 0˚ ≤ x < 360˚: cos x = cos 2x
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
given: , °
..........use the following identity :
...let
solutions:
=>=>=>
=>
so, since we have:
or
if , and °, then
°,°
if , and °, then
, °
combine all solutions:, °,°, °
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