z
#sin(−θ) = − sin θ #sin(π − θ) = sin θ sin(π #2 − θ) = cos θ #cos(−θ) = cos θ #cos(π − θ) = − cos θ #cos(π2 − θ) = sin θ #tan(−θ) = − tan θ #tan(π − θ) = − tan θ #tan(π2 − θ) = (tan θ)-1 #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) = cos a cos b + sin a sin b #sin(a − b) = sin a cos b − sin b cos a #sin(θ +π2) = cos θ #sin(θ + π) = − sin θ #sin(θ + 2π) = sin θ #cos(θ +π2) = − sin θ #cos(θ + π) = − cos θ #cos(θ + 2π) = cos θ #tan(θ +π2) = −(tan θ)−1 #tan(θ + π) = tan θ #tan(θ + 2π) = tan θ"