N nevellsb New member Joined May 2, 2016 Messages 1 May 2, 2016 #1 Hey i need help proving this cos(x-(pi/4))-cos(x+(pi/4))= (√2)(sinx) I must use and be able to label the identity applied to the function, as, algebra, reciprocal, quotient, pythagorean,evaluation, sum or distance thank you
Hey i need help proving this cos(x-(pi/4))-cos(x+(pi/4))= (√2)(sinx) I must use and be able to label the identity applied to the function, as, algebra, reciprocal, quotient, pythagorean,evaluation, sum or distance thank you
D Deleted member 4993 Guest May 2, 2016 #2 nevellsb said: Hey i need help proving this cos(x-(pi/4))-cos(x+(pi/4))= (√2)(sinx) I must use and be able to label the identity applied to the function, as, algebra, reciprocal, quotient, pythagorean,evaluation, sum or distance thank you Click to expand... What would you call the identity: Cos(A+B) = Cos(A)*Cos(B) - Sin(A)*Sin(B)
nevellsb said: Hey i need help proving this cos(x-(pi/4))-cos(x+(pi/4))= (√2)(sinx) I must use and be able to label the identity applied to the function, as, algebra, reciprocal, quotient, pythagorean,evaluation, sum or distance thank you Click to expand... What would you call the identity: Cos(A+B) = Cos(A)*Cos(B) - Sin(A)*Sin(B)
