Write as sine, cosine, or tangent of an angle sin(pi/3) cos(pi/7) - sin(pi/7) cos(pi/3). And if you can, please explain how you got this

Question

ganeshie8 · Answer

use this formula :-

$\large   \sin (A-B)  = \sin (A) \cos (B) - \cos (A) \sin (B)$

anonymous · Answer

ok so i did sin(a-b) as sin(pi/3)-(pi/7) which gave me 4pi/21. Is that the answer? Please excuse my stupidity

ganeshie8 · Answer

thats is $\large   \color{red}{\checkmark}$

 = sin(pi/3-pi/7) 
 = sin(4pi/21)

anonymous · Answer

oh my godness thank you so much!!

ganeshie8 · Answer

np... u wlc (: good work !