Math, asked by RehanAhmadXLX418, 2 months ago

The value of tan72° tan18° is *

Answers

Answered by chandan454380
0

Answer:

The answer is 1

Step-by-step explanation:

Using results : \tan(90^\circ-\theta)=\cot\theta ...(1) and \tan\theta\cot\theta=1 ...(2)

We have  \tan72^\circ\times \tan18^\circ

              =\tan(90^\circ-18^\circ)\times \tan18^\circ

              =\cot 18^\circ\times \tan18^\circ using result (1)

              =1 using result (2)

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