1) sin 25° cos 65° + cos 25° sin 65°
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sin 25° cos 65° + cos 25° sin 65°
= sin 25° cos (90-25) + cos 25° sin(90-25)
= sin 25° sin 25° + cos 25° cos 25°
= sin²25° + cos²25°
= 1 [sin²A+cos²A = 1]
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Answer:
1
Step-by-step explanation:
sin25cos65+cos25sin65
sin25sin25+cos25cos25
sin^2 25+Cos^2 25
=1
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