if cosa=3/5 and cosb=5/13 then cos 2 (a-b/2)

Question

Saurabh Koranglekar · Answer

sushmitha raj · Answer

cos(a-b)=2cos 2 (a-b/2)-1 cos 2 (a-b/2)=cos(a-b)+1/2 cos(a-b)=cosa.cosb+sina.sinb cos 2 (a-b/2)=1/2(15/65+48/5-1) =-1/65

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if cosa=3/5 and cosb=5/13 then cos 2 (a-b/2)

if cosa=3/5 and cosb=5/13 then cos²(a-b/2)

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if cosa=3/5 and cosb=5/13 then cos 2 (a-b/2)

if cosa=3/5 and cosb=5/13 then cos2(a-b/2)

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if cosa=3/5 and cosb=5/13 then cos²(a-b/2)