Sin25° cos 65°+ cos25° sin 65°
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sin25°. sin(90-65)° + cos25°. cos(90-65)°
=sin25°.sin25°+cos25°.cos25°
=sin^2 25°+cos^2 25°
=1
=sin25°.sin25°+cos25°.cos25°
=sin^2 25°+cos^2 25°
=1
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