Question

cosA x cosB - sinA x sinB (tanA=1;tanB=sq root 3)

Answer 1

tan A=1
sinA/cosA=1
sinA=cosA;------(1)
=tan B=root 3
sinB=cosB.root 3;-----(2)
cosA.cosB - sinA.sinB
=cosA.cosB-cosA.cosB.root 3

Answer 2

Hey dear here is ur answer ✅
It is given that

tanA=1
So A=45°
And tanB=√3
So B=60°
E
We know that it is formula of cos(A+B)
So putting given values and now
=Cos(60°+45°)
=cos105°=√3-1/2 √2
Hope it will help you