cos 18 °+ cos 162°+ sin 126° + sin 234°= ?
Answers
Answered by
4
Answer:
Step-by-step explanation:
cos 162 = cos( 180 - 18 )
cos 162 = - cos 18
sin 126 = cos( 90 + 36)
sin 126 = - cos 36
sin 234 = cos(270 - 36)
sin 234 = - cos 36
cos 18 - cos 18 - cos 36 -cos 36
-2cos 36
-2(0.8090)
-1.6180
Answered by
5
Answer:
Step-by-step explanation:
Cos18 + Cos (180 - 162) + Sin126 + Sin(360 - 234)
Cos18 - Cos18 + Sin126 - Sin126 = 0
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