Basic forms Egley Trig Identities

Symbol needed: θ a = α b = β

sin²(θ)+cos²(θ)=

sin²(θ)+cos²(θ)=

1

tan²(θ)+1=

sec²(θ)

tan²(θ)=

sec²(θ)-1

sin(a+b)=

sin(a)cos(b)+cos(a)sin(b)

cos(a+b)=

cos(a)cos(b)-sin(a)sin(b)

sin(2a)=

2sin(a)cos(a)

cos(2a)=

cos²(a)-sin²(a)

sin²(θ)=

1/2(1-cos(2θ))

cos²(θ)=

1/2(1+cos(2θ))