Use an Addition or Subtraction Formula to Find the Solutions $[ 0 , \pi )$

question 1

Multiple Choice

Use an addition or subtraction formula to find the solutions of the equation that are in the interval $[ 0 , \pi )$ . $\cos 8 t \cos 5 t = - \sin 8 t \sin 5 t$

• A) \(t = \frac { \pi } { 6 } , t = \frac { \pi } { 2 } , t = \frac { 5 \pi } { 6 }\)
• B) \(t = \frac { 3 \pi } { 5 } , t = \frac { 4 \pi } { 5 }\)
• C) \(t = \frac { \pi } { 3 } , t = \frac { 2 \pi } { 3 }\)
• D) \(t = \frac { \pi } { 8 } , t = \frac { 3 \pi } { 8 } , t = \frac { 5 \pi } { 8 }\)
• E) \(t = 0 , t = \frac { \pi } { 3 } , t = \frac { 2 \pi } { 3 }\)

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