Prove that:

cos20°cos40°cos80°=1/8

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

Step-by-step explanation:

hope its helps you have a great day keep smiling be happy stay safe ☺

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

idkit the do u know da way and ligma consumed ninja

step-by-step explanation: