How many of the following relations are correct? (1)1. Sin(A+B)

1.	How many of the following relations are correct? (1)1. Sin(A+B) = sinAcosB + cosAsinB (2)2. cos(A-B) = CosAcosB - sinAsinB (1)3. Tan (A-B) = tanA−tanB1+tanAtanB (2)4. Sin(A+B) (sin(A-B) = cos2A−cos2B __
Answer» How many of the following relations are correct? (1)1. Sin(A+B) = sinAcosB + cosAsinB (2)2. cos(A-B) = CosAcosB - sinAsinB (1)3. Tan (A-B) = $\frac{t a n A - t a n B}{1 + t a n A t a n B}$ (2)4. Sin(A+B) (sin(A-B) = $c o s^{2} A - c o s^{2} B$ __

How many of the following relations are correct? (1)1. Sin(A+B) = sinAcosB + cosAsinB (2)2. cos(A-B) = CosAcosB - sinAsinB (1)3. Tan (A-B) = tanA−tanB1+tanAtanB (2)4. Sin(A+B) (sin(A-B) = cos2A−cos2B __

Answer»

How many of the following relations are correct?

(1)1. Sin(A+B) = sinAcosB + cosAsinB

(2)2. cos(A-B) = CosAcosB - sinAsinB

(1)3. Tan (A-B) = $\frac{t a n A - t a n B}{1 + t a n A t a n B}$

(2)4. Sin(A+B) (sin(A-B) = $c o s^{2} A - c o s^{2} B$