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Write in Terms of the Cofunction of a Complementary Angle $\cos \frac { \pi } { 20 }$

Question 288

Multiple Choice

Write in terms of the cofunction of a complementary angle.
- $\cos \frac { \pi } { 20 }$

A) $\sin \frac { 19 \pi } { 20 }$
B) $\sec \frac { 19 \pi } { 20 }$
C) $\sin \frac { 9 \pi } { 20 }$
D) $\sec \frac { 9 \pi } { 20 }$

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