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Find the Value of `(Cos 38° Cosec 52°)/(Tan 18° Tan 35° Tan 60° Tan 72° Tan 55°)`

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Question

Find the value of `(cos 38° cosec 52°)/(tan 18° tan 35° tan 60° tan 72° tan 55°)`

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Solution

`(cos 38°   cosec 52°)/(tan 18°   tan 35°   tan 60°   tan 72°  tan 55°)`

`= ( cos 38 °    sec (90°-52°))/( cot (90° -18° ) cot (90° -35° ) tan 60° tan 72° tan 55°)`

 =` (cos 38°  sec 38°)/( cot 72° cot 55°  tan 60°   tan 72°  tan 55°)`

=`(cos 38° xx1/(cos 38°))/(1/(tan 72°) xx1/( tan 55°) xx sqrt(3 ) xx tan 72° xx tan 55°)`

=`1/sqrt(3)`

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Chapter 13: Trigonometric identities - Exercises 3

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R.S. Aggarwal Mathematics [English] Class 10
Chapter 13 Trigonometric identities
Exercises 3 | Q 38
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