Sin (3x+20)=Cos (3y-20),find tan(x+y)
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Given that,
sin (3x + 20) = cos (3y - 20)
⇒ sin (3x + 20) = sin {90 - (3y - 20)}
⇒ 3x + 20 = 90 - (3y - 20)
⇒ 3x + 20 = 90 - 3y + 20
⇒ 3x + 3y = 90
⇒ x + y = 30
∴ tan (x + y)
= tan30°
= 1/√3
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