cos 2x= 1-2sin^2x
= 1-2 . (5/13)^2
=1-2. 25/169
= 1-50/169
=169/169 - 50/169
=119/169
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cos 2x= 1-2sin^2x
= 1-2 . (5/13)^2
=1-2. 25/169
= 1-50/169
=169/169 - 50/169
=119/169