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sertanlavr [38]
3 years ago
8

It's a prove that...2sin70.cos20=sin90+sin50​

Mathematics
2 answers:
Len [333]3 years ago
5 0

Answer:

Step-by-step explanation:

As we have,

2sinxcosy = sin(x + y) + sin(x - y)

=2sin70cos20\\\\=sin(70 + 20) + sin(70 - 20)\\\\=sin90 + sin50

Hence, LHS=RHS

vlabodo [156]3 years ago
3 0

LHS = RHS

2sinxcosy = sin(x + y) + sin(x - y)

= 2sin70cos20

= sin (70+ 20) + sin(70 - 20)

=sin90+ sin50

Hence, Proved

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