8. Introduction to Trigonometry
medium

જો $2A$ એ લઘુકોણનું માપ હોય તથા $\tan 2 A=\cot \left(A-18^{\circ}\right)$ હોય, તો $A$ની કિંમત શોધો.

A

$108$

B

$90$

C

$18$

D

$36$

Solution

Given that,

$\tan 2 A=\cot \left(A-18^{\circ}\right)$

$\cot \left(90^{\circ}-2 A \right)=\cot \left( A -18^{\circ}\right)$

$90^{\circ}-2 A = A -18^{*}$

$108^{\circ}=3 A$

$A=36^{\circ}$

Standard 10
Mathematics

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