Maths / Introduction to Trigonometry / Trigonometric Identities

QUESTION

$\dpi{80} \fn_phv sin\: \: 2A=2\: \: sin\: \: A$  is the true when A =

 OPTIONS A. $\dpi{80} \fn_phv 0^o$ B. $\dpi{80} \fn_phv 30^o$ C. $\dpi{80} \fn_phv 45^o$ D. $\dpi{80} \fn_phv 60^o$
Right Option : A

EXPLANATION
Explain TypeExplanation Content
Text

given sin2A=2sinAwe know that sin2A=2sinAcosAso, 2sinAcosA=2sinAdivide with 2sinA on both sides ,we get cosA=1cosA=cos0A=0

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