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Aliun
[14]
2 years ago
5
Sin78 ×cos42+cos78×sin42 evaluate without the use of a calculator
Mathematics
Answer
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1
answer:
Novay_Z
[31]
2 years ago
4
0
Sin a * cos b + cos a * sin b=sin (a+b)
sin 78 * cos 42 + cos 78* sin 42=sin (78+42)=sin 120=sin(180-120)=
sin 60=√3 / 2
Answer: sin 78 * cos 42 + cos 78* sin 42=<span>
√3 / 2
</span>
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