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Trigonometric Ratios of (90° + θ)

   In PON,

   sinθ=y

   cosθ=x

   tanθ=yx

   cotθ=xy

   secθ=1x

   cosecθ=1y

   Since PONOPN,

   y=x and x=y numerically.

   But P(x,y) lies in the second quadrant.

y=x and x=y.

   sin(90+θ)=y=x=cosθ

   cos(90+θ)=x=y=sinθ

   tan(90+θ)=yx=xy=cotθ
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   cot(90+θ)=xy=yx=tanθ

   sec(90+θ)=1x=1y=cosecθ

   cosec(90+θ)=1y=1x=secθ

 θ တန္ဖိုး႐ိုက္ထည့္ၾကည့္ပါ။

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