Question

look at the picture
need anwer (ii)ASAP....​

Answer 1

Answer:

given

tanA = 1/√3 = tan30°

so, angle A = 30°

in ∆ ABC

A+B+C= 180°

B+C= 180° - A

B+C = 180° - 30°

B+C = 150°

now

cosAcosC - sinAsinC

= cos(A+C)

= cos 150°

= cos(180-30)

= -cos30° ( cos(180-A) = -cosA)

= -√3/2

Answer 2

Answer:

ans is 0

Step-by-step explanation:

cos a cos c - sin a sin c

cos a = adjacent/hypotenuse = root 3/2

cos c= 1/2

sin a  = opposite/hypotenuse =root3/2

sin c=1/2

cos a cos c - sin a sin c

root3/2 x 1/2 - root3/2 x 1/2

=0

hope this answer was helpful