Trigonometric Sum Identity

I understood the book soln but it goes about it in a very strange way by calculating the sin sum identity, tried to find a different soln but couldn't so can y'all come up with anything?
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9 Replies
iTeachChem Helper
@Apu @Apu
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iTeachChem Helper
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.
coolguy.
coolguy.3mo ago
Is the ans -1 If it's not it's prolly my calc error, anyways take A=B=pi/4, now this was only intuition cause I thought about possible cases of the angles But you'll get the right ans Hopefully
Nephilim
NephilimOP3mo ago
It is
coolguy.
coolguy.3mo ago
It's a way to save time in exam
Nephilim
NephilimOP3mo ago
ik but im trynna look for the way here lol
coolguy.
coolguy.3mo ago
Isn't this a way too :')
Nephilim
NephilimOP3mo ago
Yea ig :0

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