Is tan(x + 90) = -cot(x) ?
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Yes, . (I am assuming that your "x" and "90" are in degrees since that is the only way this would be true.)
By , I assume you mean . Use the sum of angles formulas for sine and cosine.
Then what did I do wrong?
is not defined. That is why you were told to use the sum of angles formulas for sine and cosine, not the sum of angles formula for tangent.
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