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it's a prove that...

2sin70.cos20=sin90+sin50​

Sagot :

Nepalieducation

Answer:

Step-by-step explanation:

As we have,

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

[tex]=2sin70cos20\\\\=sin(70 + 20) + sin(70 - 20)\\\\=sin90 + sin50[/tex]

Hence, LHS=RHS

Xignerso

LHS = RHS

[tex]2sinxcosy = sin(x + y) + sin(x - y)[/tex]

[tex]= 2sin70cos20[/tex]

[tex] = sin (70+ 20) + sin(70 - 20)[/tex]

[tex]=sin90+ sin50[/tex]

Hence, Proved

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