If cos(x - 15°) = √3/2, what is the value of tan(x + 15°)?


A

√3


B

1

C

1/√3


D

0

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Question: If cos(x - 15°) = √3/2, what is the value of tan(x + 15°)?

​Solution: 
​cos(x - 15°) = √3/2
​⇒ cos(x - 15°) = cos 30°
​​⇒ x - 15° = 30°
​​⇒ x = 30° + 15°
​∴ x = 45°

​Now,
tan(x + 15°)
​= ​tan(45° + 15°)
​= tan 60°
​= √3

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Updated: 1 month ago

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