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If 5(tan 2 x−cos 2 x)=2cos2x+9, then the value of cos4x is

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by Expert (37.5k points) ●157 ●536 ●1106 in Uncategorized 85 views
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If 5(tan2x - cos2x)=2cos2x+9, then the value of cos4x is 

A)-3/5

B)1/3

C)2/9

D)-7/9

 

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by Expert (37.5k points) ●157 ●536 ●1106
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See the below image , 

Solution

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