Question
How do i find the exact value for:
(cos5pi/16)(cospi/16)+ (sin5pi/16)(sinpi/16)
(cos5pi/16)(cospi/16)+ (sin5pi/16)(sinpi/16)
Answers
Steve
cosAcosB + sinAsinB = cos(A-B)
so, what is 5π/16 - π/16?
so, what is 5π/16 - π/16?