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Without Using Trigonometric Tables, Evaluate : Cosec 42 ∘ Sec 48 ∘ - Mathematics

Sum

Without using trigonometric tables, evaluate :

`("cosec"  42^circ)/sec 48^circ`

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Solution

`("cosec"  42^circ)/sec 48^circ`

= `("cosec" (90^circ - 48^circ))/sec 48^circ`

= `sec 48^circ/sec 48^circ`  [`because` sec (90-θ) = cosec θ]

= 1

Concept: Trigonometry
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APPEARS IN

RS Aggarwal Secondary School Class 10 Maths
Chapter 7 Trigonometric Ratios of Complementary Angles
Exercise | Q 1.5 | Page 312
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