Mark the Correct alternative in the following:
sin 47o + sin 61o – sin 11o – sin 25o is equal to
sin 47° + sin 61° - sin 11° - sin 25°
= (sin 47° - sin 25°) + (sin 61° - sin 11°)
= 2cos 36° sin 11° + 2cos 36° sin 25°
= 2cos 36° (sin 11° + sin 25°)
= 2cos 36° (2sin 18° cos 7°)
= 4cos 36° sin 18° cos 7°
= cos 7°
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Generated by AI. May contain inaccuracies — always verify with your textbook.
