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Grade: 11 

                        
Sin24degree cos6degree-sin6degree sin66segree/sin21degree cos39degree- cos51degree sin69degree
2 years ago

Answers : (1)

mansi hedav
13 Points 
							
=(cos66cos6-sin6sin66)/(cos69cos39-sin39sin69)   {using fourmula of sin(90-\Theta)}
=cos(66+6)/cos(69+39)   {using fourmula of cos(c+d)}
=cos72/cos108
= -1
2 years ago
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