हिंदी

Given A = 60° and B = 30°, prove that: tan (A - B) = ABABtanA – tanB1+tanA.tanB - Mathematics

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प्रश्न

Given A = 60° and B = 30°,

prove that: tan (A - B) = `(tan"A"  –  tan"B")/(1 + tan"A".tan"B")`

योग
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उत्तर

LHS = tan(A – B) 

= tan (60° – 30°)

= tan30°

= `(1)/(sqrt3)`

RHS = `(tan"A"  –  tan"B")/(1 + tan 60°. tan 30°)`

= `(tan60° –  tan30°)/(1+tan 60°.tan30°)`

= `(sqrt3  –  1/(sqrt3))/(1 + sqrt3(1/sqrt3))`

= `(2)/(2sqrt3)`

= `(1)/sqrt3`

LHS = RHS

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अध्याय 23: Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios] - Exercise 23 (B) [पृष्ठ २९३]

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सेलिना Concise Mathematics [English] Class 9 ICSE
अध्याय 23 Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios]
Exercise 23 (B) | Q 1.4 | पृष्ठ २९३
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