sin Ө = - 5/13
cos 2Ө = 1 - 2 sin²Ө
cos 2Ө = 1 - 2 (25/169)
cos 2Ө = 1 - 50/169
cos 2Ө = 119 / 169
cos(2θ) = 1-2sin²(θ) = 1-2(-5/13)² =1 - (50/169) = 119/169
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sin Ө = - 5/13
cos 2Ө = 1 - 2 sin²Ө
cos 2Ө = 1 - 2 (25/169)
cos 2Ө = 1 - 50/169
cos 2Ө = 119 / 169
cos(2θ) = 1-2sin²(θ) = 1-2(-5/13)² =1 - (50/169) = 119/169