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प्रश्न
if `cos theta = 4/5` find all other trigonometric ratios of angles θ
उत्तर
Given cos θ = `4/5`
sin2θ + cos2θ = 1
`sin^2theta + (16/25)=1`
`sin^2 theta = 1 - 16/25`
`sin^2 theta = 9/25`
`sin theta = 3/5`
`tan theta = sin theta/cos theta = (3/5)/(4/5)= 3/4`
`cosec theta = 1/sin theta = 5/3`
`sec theta = 1/cos theta = 5/4`
`cot theta = 1/tan theta = 4/3`
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