Use the Value of the Trigonometric Function to Find $\cos ( t + \pi )$

question 286

Multiple Choice

Use the value of the trigonometric function to find $\cos ( t + \pi )$ . $\cos t = \frac { 7 } { 8 }$

• A) \(\cos ( t + \pi ) = \frac { 7 } { 8 }\)
• B) \(\cos ( t + \pi ) = - \frac { 8 } { 7 }\)
• C) \(\cos ( t + \pi ) = \infty\)
• D) \(\cos ( t + \pi ) = \frac { 8 } { 7 }\)
• E) \(\cos ( t + \pi ) = - \frac { 7 } { 8 }\)