find the value of cos -(1410)
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cos(-1410)= cos (3*2*360+330) ( as cos(-x)=cosx)
therefore, cos(330)
this can be written as cos (360-30)
and since the angle is in forth quadrant therefore cos is +ve.
this simplifies to cos30 ( as cos(360-x)=cosx)
so cos30 is √3/2
there you go
therefore, cos(330)
this can be written as cos (360-30)
and since the angle is in forth quadrant therefore cos is +ve.
this simplifies to cos30 ( as cos(360-x)=cosx)
so cos30 is √3/2
there you go
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