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Grade: 11 

                        
Show that sin 23 degrees + sin 37 degrees = cos 7 degrees
4 years ago

Answers : (1)

Vikas TU
12277 Points 
							
Dear Varad,
Apply sinc + sind formulae:
SinC + SinD = 2Sin[(C+D)/2]Cos[(C-D)/2]
thus it becomes, = > 2sin30cos7 = 2*cos7/2 = cos7
4 years ago
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