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Show that sin 23 degrees + sin 37 degrees = cos 7 degrees

Show that sin 23 degrees + sin 37 degrees = cos 7 degrees

Grade:11

1 Answers

Vikas TU
14149 Points
5 years ago
Dear Varad,
Apply sinc + sind formulae:
SinC + SinD = 2Sin[(C+D)/2]Cos[(C-D)/2]
thus it becomes, = > 2sin30cos7 = 2*cos7/2 = cos7

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