What is the exact value of cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees
do you know the formula
cos(A+b) = cosAcosB - sinAsinB
now compare it with your
cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees
do you know the formula
cos(A+b) = cosAcosB - sinAsinB
now compare it with your
cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees