compound angles

Sin(A+B) is

• SinACosB + cosAsinB

• SinACosB - cosAsinB

• sinAcosB

• None

cos(A-B) is

• cosAsinB + sinAcosB

• cosA CosB + sinAsinB

• cosA CosB - sinAsinB

• None

cos2A is

• $\cos^2A\ +\sin\ ^2A$

• $\cos^2A-\sin^2A$

• 2sinAcosA

• None

tan(A+B)

• $\frac{\tan A+\tan B}{1-\tan A\tan B}$

• $\frac{\tan A+\tan B}{1+\tan A\tan B}$

• tanAtanB + cotAcotB
  

• None

cos3A is

• $3\cos A-4\cos^3A$

• $4\cos^3A\ -3\cos A$
  

• 0
  

• None

If cosA =0 then cos2A is

• -1

• 1

• 0

• None

sin3A is

• 3sinAcosA

• $3\sin A\ -\ 4\sin^3A$

• $4\sin^3A\ -\ 3\sin A$

• None

2sinA/2cosA/2 is

• $\frac{1}{\sqrt{2}}$

•  $\cos A$ 

•  $\sin A$ 

• None

If sinA = cosA then A is

• $\frac{1}{\sqrt{2}}$

• 45

• $\frac{1}{2}$

• None

cos0 is

• 0

• 1

• 1/2

• None