Help me.

How to prove that:

1) 2cosa-cos3a-cos5a=16cos3a. sin2a

2) sina(cos2a+cos4a+cos6a)=cos4a. sin3a

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

£56

step-by-step explanation:

u divide 24 by 3 and u get 8 so if u do 8 time 7 or 8+8+8+8+8+8+8 u get 56 and 56 divided by 7 is 8.

are ya tryin to ask something or is this a statement

roots are from trees

step-by-step explanation: