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Grade: 11
        
Please  q no 8 and 9.                       Aaaaaa\\aaaaaaaaaaaaaaaaaaaaaaaaaaaaa\aaa  
3 months ago

Answers : (1)

Arun
22777 Points
							
 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
3 months ago
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