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5sin(x+tan^-1(4/3))=3sinx+4cosx. proof?

5sin(x+tan^-1(4/3))=3sinx+4cosx. proof?
asked 117k views
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5sin(x+tan^-1(4/3))=3sinx+4cosx. proof?

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User Tom Lime
by
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1 Answer

7 votes
5sin(x+tan^-1(4/3))=5sinx*cos(tan^-1(4/3))+5cosx*sin(tan^-1(4/3))
=5sinx*(3/5)+5cosx*(4/5)
=3sinx+4cosx
answered
User Shadi Abo Ahmad
by
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