A factory took 5 days to make certain number of dolls. It would take 3 days to make the same number of dolls if it made 350 more
dolls each day. How many dolls did the factory make
1 answer:
You might be interested in
Answer:
see explanation
Step-by-step explanation:
Using the double angle identity for sine
sin2x = 2sinxcosx
Consider left side
cos20°cos40°cos80°
= (2sin20°cos20°)cos40°cos80°
= (2sin40°cos40°)cos80°
= (sin80°cos80° )
= (2sin80°cos80° )
= . sin160°
= . sin(180 - 20)°
= . sin20°
= = right side , thus proven