A) \[tan\text{ }26{}^\circ \]
B) \[tan\text{ 81}{}^\circ \]
C) \[tan\text{ 51}{}^\circ \]
D) \[tan\text{ 54}{}^\circ \]
E) \[tan\text{ 46}{}^\circ \]
Correct Answer: D
Solution :
\[\frac{cos\text{ }9{}^\circ +sin\text{ }9{}^\circ }{cos\text{ }9{}^\circ -sin\text{ }9{}^\circ }=\frac{1+tan\text{ }9{}^\circ }{1-tan\text{ }9{}^\circ }\] \[=tan(45{}^\circ +9{}^\circ )\] \[=tan\text{ }54{}^\circ \]
You need to login to perform this action.
You will be redirected in
3 sec
