Question

what is the half angle formula

Answer 1

@Loser66

Answer 2

sin 2x = 2 sinx cosx

Answer 3

and some more.

Answer 4

so how do i find cos75 degree with the half angle fomula

Answer 5

what is wrong @Loser66

Answer 6

nothing wrong, just memorize the formula
\[cos^2x = \dfrac{1+cos2x}{2}\]
if your angle is 75, then 2x = 150 , cos (2x) = \(\dfrac{-\sqrt{3}}{2}\) plug all in, and make some more calculation to get \(\large cos^2x\), after then take square root of the result to get the final one
The wrong thing is "I DO IT" instead of YOU

Answer 7

no i give you example question and i solve my own 4 problems i use this as a guide
@love10129151

Answer 8

i ment @Loser66

Answer 9

can i get the explination please