(40pts)

sina sinb = 1/2 * (cosa cosb + sina sinb - cosa cosb + sina sinb)

how do i get from this ^^ to

sina sinb = 1/2 * (2 * sina sinb)

need someone who can explain how to do it

➷ Just work with what is inside the parenthesis

Also, move around the terms to help it make more sense:

(cosA cosB - cosA cosB + sinA sinB + sinA sinB)

As you can see, the 'cosA cosB' would cancel out through subtraction.

Now we have this:

(sinA sinB + sinA sinB)

This is just two sets of sinA sinB so it can be written as:

(2 * sinA sinB)

Simply place the values outside the parenthesis back there to get the answer

SinA sinB = 1/2 * (2 * sinA sinB)

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

i need a picure

step-by-step explanation: