cos^2 25°+cos ^2 95°+cos^2 15°
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cos ^2 25° + cos ^ 2 95° + cos ^ 2 15 °
= cos ^ 2 ( 25° + 95°) + cos ^ 2 15°
= cos ^ 2 100° + cos ^ 2 15°
= cos ^2 (100°+ 15°)
= cos ^2 105°
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