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Mathematics

If cosec θ = 10\sqrt{10}, find the values of other trigonometrical ratios for θ.

Trigonometrical Ratios

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Answer

cosec θ = hypotenuseperpendicular=101\dfrac{\text{hypotenuse}}{\text{perpendicular}} = \dfrac{\sqrt{10}}{1}.

Let hypotenuse = 10x\sqrt{10}x and perpendicular = x.

By pythagoras theorem, we get :

Hypotenuse2 = Base2 + Perpendicular2

Base2 = Hypotenuse2 - Perpendicular2

Base2 = (10x)2(\sqrt{10}x)^2 - x2

Base2 = 10x2 - x2

Base2 = 9x2

Base = (9x2)(\sqrt{9x^2})

Base = 3x

sin θ = perpendicularhypotenuse=x10x=110\dfrac{\text{perpendicular}}{\text{hypotenuse}} = \dfrac{x}{\sqrt{10}x} = \dfrac{1}{\sqrt{10}}

cos θ = basehypotenuse=3x10x=310\dfrac{\text{base}}{\text{hypotenuse}} = \dfrac{3x}{\sqrt{10}x} = \dfrac{3}{\sqrt{10}}

tan θ = perpendicularbase=x3x=13\dfrac{\text{perpendicular}}{\text{base}} = \dfrac{x}{3x} = \dfrac{1}{3}

cot θ = baseperpendicular=3xx=3\dfrac{\text{base}}{\text{perpendicular}} = \dfrac{3x}{x} = 3

sec θ = hypotenusebase=10x3x=103\dfrac{\text{hypotenuse}}{\text{base}} = \dfrac{\sqrt{10}x}{3x} = \dfrac{\sqrt{10}}{3}

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