8. Introduction to Trigonometry
medium

$\tan 5 \cdot \tan 25 \cdot \tan 45 \cdot \tan 65 \cdot \tan 85$ ની કિમંત મેળવો.

A

$3$

B

$2$

C

$1$

D

$0$

Solution

$\tan 5 \cdot \tan 25 \cdot \tan 45 \cdot \tan 65 \cdot \tan 85$

$=\tan 5 \times \tan 25 \times 1 \times \tan (90-25) \times \tan (90-5)$

$=\tan 5 \times \tan 25 \times 1 \times \cot 25 \times \cot 5$

$=(\tan 5 \times \cot 5) \times 1 \times(\tan 25 \times \cot 25)$

$=1 \times 1 \times 1=1$

Standard 10
Mathematics

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