Question

if cos(A-B)= 3 cos(A+B) , then CotACotB is

Answer 1

cosAcosB + sinAsinB=3(cosAcosB-sinAsinB)

cosAcosB+sinBsinA=3cosAcosB-3sinAsinB

2cosAcosB=4sinAsinB

cosAcosB/sinAsinB=4/2

cotAcotB=2

(cosa/ Sina= cotA )

Answer 2

Answer:

Hope it helps

Step-by-step explanation:

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