Question

if 2 tana 2 tanb 2 prove that cosa=3+5cosb/5+3cosb

Answer 1

sorry to say that

but aapka question incomplete hai

Sayed questions m miss print hua ho

questions ye hona chahiye..2 tan A/2 = tan B/2prove that cosA=3+5cosB/5+3cosB

given in the question 2 tan A/2 = tan B/2

check the availability from the both side

angle A= B =0

2 tan 0= tan 0

now cos A =( 3 + 5 cos B)/(5+ 3 cos B)

cos 0 =( 3+ 5 cos 0)/ (5 + 3 cos 0)

we know the value of cos 0 = 1

so put the value of cos 0 = 1

1 = (3+5)/(3+5)

1= (8/8)

1 = 1

LHS = RHS