Mathematics
If tan4 A - 1 = 0 and angle A is acute, then A is :
30°
45°
± 45°
± 30°
Trigonometric Identities
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Answer
tan4 A - 1 = 0
⇒ tan4A = 1
⇒ (tan A)4 = 1
⇒ tan A = tan 45°
⇒ A = 45°
Hence, option 2 is the correct option.
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