Question

Cos A. CosB Formula? ​

Answer 1

Step-by-step explanation:

COS A * COS B

1/SEC A / I SEC B

1/SEC WIL CANCEL

REMAINING IS A*B

PLEASE MAKE BRAINLIST HEARTILY AND THANKSGIVING ALSO

Answer 2

Answer:

2 cosA sinB = sin(A + B) − sin(A − B) 2 cosA cosB = cos(A + B) + cos(A − B)