trigono. ...is ..interesting..!!!

Geometry Level 3

( sin ⁡ 12 ° ) 2 + ( sin ⁡ 21 ° ) 2 + ( sin ⁡ 39 ° ) 2 + ( sin ⁡ 48 ° ) 2 − ( sin ⁡ 9 ° ) 2 − ( sin ⁡ 18 ° ) 2 = ? (\sin12°)^2 +(\sin21°)^2 +(\sin39°)^2 +(\sin48°)^2 - (\sin9°)^2 - (\sin18°)^2 = \, ?


The answer is 1.

Aniket Sanghi by Aniket Sanghi , 21, India

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1 solution

Ahmad Saad
Feb 7, 2016

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