cos O = ?..

Asked by  | 26th Nov, 2012, 07:06: PM

Expert Answer:

WE KNOW THAT SIN 30=COS (90-30)= COS 60,
AND SIN 30 =1/2
SO OBVIOUSLY COS 60 =1/2

Answered by  | 27th Nov, 2012, 05:16: PM

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