Solved step of cos(-840)
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we know that cos(-x)=cosx
like that
cos(-840)= cos840
cos(-840) = cos (2×360-120)°
=. cos (120). [cos(2×360-x)=cosx]
= cos(180-60).
= -cos60 cos(180-x)= -cosx
cos(-840) = -1/2
like that
cos(-840)= cos840
cos(-840) = cos (2×360-120)°
=. cos (120). [cos(2×360-x)=cosx]
= cos(180-60).
= -cos60 cos(180-x)= -cosx
cos(-840) = -1/2
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