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CBSE Class 9 Answered

cos O = ?..
Asked by | 26 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 | 27 Nov, 2012, 05:16: PM
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