If Ø =18° find 4 sin2 Ø + 2sin Ø=?

If Ø =18° find 4 sin2 Ø + 2sin Ø=?

could u plz, tell me how to solve the above que?
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1 Answer

angel=18 deg, so 2*angel=36 deg

sine(36 deg)=0.587785252

4*sine(36 deg)=2.351141009

###### sine(18 deg)=0.309016994
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