1.

tan (A-B)tan A-tan Bam A tanFind the valueton 15。am 15I+tanA tanB

Answer»

Let tan(15°) = tan(45°-30°)

We know that tan(A - B) = (tanA - tanB) /(1 + tan A tan B)

tan(45°-30°)= (tan45°- tan30°)/ (1+tan45°tan30°)

= {1- (1/√3)}/{1+(1/√3)}

∴ tan15° = (√3 - 1) / (√3 + 1)


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