AMU Engineering 2018 solved paper Solved Paper

Section: Mathematics

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Question : 147 of 150

Marks: +1, -0

Let

sin(θ−α)

sin(θ−β)

=

a

b

,

cos(θ−α)

cos(θ−β)

=

c

d

. Then the value of cos(α−β) equals

ac−bd
ad+bc
ac+bd
ad+bc
ac+bd
ab+cd
ac−bd
ab+cd

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