0
The fisrt thing to note is that there is no variable in the question and so there cannot be a solution set. The only possibilities are the statement is true, false or indeterminate.
Now, 2 cos 0 - 1 = 0
is equivalent to 2*1 - 1 = 0 [since cos(0) = 1]
or 2 - 1 = 0
which is false.
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∙ 10y ago
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