Mathematics Trigonometric Expressions

Trigonometric Expressions

Fundamental Trigonometrical Identities :

`(a)\ \ \ \ \ \ \ sinθ =1/ (cosecθ)`

`(b)\ \ \ \ \ \ \ cosθ =1/secθ`

`(c)\ \ \ \ \ \ \ cotθ =1/tanθ=cosθ/ sinθ `

`(d) \ \ \ \ \ \ \ 1 + tan^2 θ = sec^2 θ`

or,` \ \ \ \ \ \ \ sec^2 θ -tan^2 θ = 1`

`\ \ \ \ \ \ \ (secθ - tanθ)= 1/(secθ+ tanθ ) `

`(e)\ \ \ \ \ \ \ sin^2 θ + cos^2 θ = 1`

`(f) \ \ \ \ \ \ \ 1 + cot^2 θ = cosec^2 θ`

`\ \ \ \ \ \ \ (cosecθ -cotθ) =1 /(cosecθ+ cot θ)`

 
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