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  4. The equation cos t = (2/5), sin t = (3/5) have

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Q. The equation $\cos t = \frac{2}{5}, \sin t = \frac{3}{5}$ have

Trigonometric Functions

Solution:

$\cos^2 \, t + \sin^2 \, t = \frac{13}{25} \neq 1$