QuestionAugust 26, 2025

Use the P ythagorean identity to find sinx cosx=(11)/(14) sinx=([?]sqrt ([ ]))/([ ])

Use the P ythagorean identity to find sinx cosx=(11)/(14) sinx=([?]sqrt ([ ]))/([ ])
Use the P ythagorean identity
to find sinx
cosx=(11)/(14)
sinx=([?]sqrt ([ ]))/([ ])

Solution
4.3(194 votes)

Answer

sinx = \frac{\sqrt{75}}{14} Explanation 1. Apply Pythagorean Identity Use the identity sin^2x + cos^2x = 1. 2. Substitute Known Value Substitute cosx = \frac{11}{14} into the identity: sin^2x + \left(\frac{11}{14}\right)^2 = 1. 3. Calculate cos^2x Compute \left(\frac{11}{14}\right)^2 = \frac{121}{196}. 4. Solve for sin^2x Rearrange to find sin^2x = 1 - \frac{121}{196} = \frac{75}{196}. 5. Find sinx Take the square root: sinx = \sqrt{\frac{75}{196}} = \frac{\sqrt{75}}{14}.

Explanation

1. Apply Pythagorean Identity<br /> Use the identity $sin^2x + cos^2x = 1$.<br />2. Substitute Known Value<br /> Substitute $cosx = \frac{11}{14}$ into the identity: $sin^2x + \left(\frac{11}{14}\right)^2 = 1$.<br />3. Calculate $cos^2x$<br /> Compute $\left(\frac{11}{14}\right)^2 = \frac{121}{196}$.<br />4. Solve for $sin^2x$<br /> Rearrange to find $sin^2x = 1 - \frac{121}{196} = \frac{75}{196}$.<br />5. Find $sinx$<br /> Take the square root: $sinx = \sqrt{\frac{75}{196}} = \frac{\sqrt{75}}{14}$.
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