हिंदी

Without using trigonometric tables, evaluate: (cosec 42^circ)/sec 48^circ

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प्रश्न

Without using trigonometric tables, evaluate:

`("cosec"  42^circ)/sec 48^circ`

मूल्यांकन
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उत्तर

`("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

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अध्याय 12: Trigonometric Ratios of Some Complemantary Angles - EXERCISE 12 [पृष्ठ ५९०]

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 12 Trigonometric Ratios of Some Complemantary Angles
EXERCISE 12 | Q 1. (v) | पृष्ठ ५९०
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