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प्रश्न
Show that cos 38° cos 52° − sin 38° sin 52° = 0
उत्तर
cos 38° cos 52° − sin 38° sin 52°
= cos (90° − 52°) cos (90°−38°) − sin 38° sin 52°
= sin 52° sin 38° − sin 38° sin 52°
= 0
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