Evaluate :
sin2 35° - cos2 55°
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= sin2 (90° - 55°) - cos2 55°
= cos2 55° - cos2 55°
= 0
Hence, sin2 35° - cos2 55° = 0.
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Evaluate:
sin 42° sin 48° - cos 42° cos 48°
sin (90° - A) sin A - cos (90° - A) cos A
cos2 25° - sin2 65° - tan2 45°