cos 80° - cos 40° + ^3 cos 70º = 0
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Answer:
the answer to this problem is very simple
Step-by-step explanation:
Cos 80 - cos 40 + √3cos 70
=-2sin 1/2(80+40) sin 1/2(80-40)+√3cos 70
=-2 sin 60 sin 20+√3cos70
=-2(√3/2)sin 20+√3 cos 70
=-√3sin20+√3cos70
= -√3sin 20 + √3 sin(90-70)
=-√3sin 20+√3sin 20
=0
hope it helped you dude
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