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Grade 11IIT JEE Entrance Exam

Please q no 8 and 9. Aaaaaa\\aaaaaaaaaaaaaaaaaaaaaaaaaaaaa\aaa

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Profile image of Gaurav
6 Years agoGrade 11
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1 Answer

Profile image of Arun
6 Years ago
 Dear student
 
8.)
 
sin 12 sin (60-12) sin (60+12) sin 54 / sin 72 = sin (3 * 12) sin 54 / sin (90-18)
 
 = sin 36 sin 54 / cos 18 = 2 sin 36 cos 36 / 2 cos 18 = sin 72 / 2 cos 18
 
= cos 18/ 2 cos 18 = ½
 
Hope it helps

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