# Write an expression for tan in terms of sin and cos

If either argument is NaN, then the result is NaN. If the first argument is positive zero and the second argument is positive, or the first argument is positive and finite and the second argument is positive infinity, then the result is positive zero.

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Jul 22,  · Homework Help: Rewriting in terms of another (Trigonometry) Jul 21, #1. Write tanx in terms of sinx, x is in Quadrant 4. tanx = -sinx/cosx (-sinx because sinx is negative in Q4) Ok from $$tan(x)= \frac{-sin(x)}{cos(x)}$$ try using a formula for $$sin^2(x)$$ (hint the one that involves 1 and $$cos^2(x)$$).