Use the Fundamental Identities to Find the Value of the Trigonometric

question 196

True/False

Use the fundamental identities to find the value of the trigonometric function.
- $$\cos \frac { \pi } { 72 } = \cos \frac { \pi } { 9 } \cos \frac { \pi } { 8 } - \sin \frac { \pi } { 9 } \sin \frac { \pi } { 8 }$$

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