Question

if cos (x+20)=sin 60,find the value of tan (3x+15)​

Answer 1

Answer:

cos (x+20)=sin 60

cos(x+20)=√3/2

cos 30=√3/2

x+20 =30

x=10

tan (3x+15)

tan(3×10+15)

tan(30+15)

tan 45=1

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