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Without Using Trigonometric Tables, Evaluate : Sin 16 ∘ Cos 74 ∘ - Mathematics

Sum

Without using trigonometric tables, evaluate :
`sin 16^circ/cos 74^circ`

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Solution

`sin 16^circ/cos 74^circ`

= `sin (90^circ - 74^circ)/cos 74^circ`

= `cos 74^circ/cos 74^circ` [∵ sin (90-θ) = cos 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 1.1 | Page 312
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