How do you prove #sin2x = 2sinxcosx# ?

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Oct 24, 2016

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Por favor ver más abajo.

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The question appears to be in Spanish and I am answering in English. I hope answer will satisfy you.

Recall formulas for trigonometric ratios of sum of angles, particularly

#sin(A+B)=sinAcosB+cosAsinB#

if #A# and #B# both are equal to #x#

this becomes

#sin(x+x)=sinxcosx+sinxcosx=2sinxcosx#

or #sin2x=2sinxcosx#

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