Hello !
cos (a+b) = cos a cos b - sin a sin b
sin (a+b) = sin a cos b + sin b cos a
cos (a+b+c) = cos (a+(b+c))
cos (a+b+c) = cos a cos (b+c) - sin a sin (b+c)
cos (a+b+c) = cos a (cos b cos c - sin b sin c) - sin a (sin b cos c + sin c cos b)
cos (a+b+c)=cos a cos b cos c - cos a sin b sin c - sin a sin b cos c - sin a cos b sin c
Answer:
20 are cows 10 chickens 20 times 4 is 80 10 times 2 equals 20 80+20=100
Step-by-step explanation:
The answer would be =4 over 9 =4/9 hope this helps
6p^3+29p^2+22p-21 i believe!
68+32=100 he used a $100 bill