Math, asked by Justin6965, 9 months ago

Sin18 sin54  ____________________

Answers

Answered by abpinku21

4

Answer:

=sin18+sin(180+54)

=sin18-sin54=-2cos36sin18

=(2sin^2 18-1)sin18

=2sin^3 18-sin18

=0.0590-0.3090

=-0.25=-1/4 it is not -1/2

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