Evaluate: Cosec(65° + A) - Sec(25° - A) - Mathematics

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Sum

Evaluate: cosec (65° + A) - sec (25° - A)

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Solution

cosec (65° + A) - sec (25° - A)

= cosec [90° - (25° - A)] - sec (25° - A)

= sec (25° - A) - sec (25° - A)

= 0.

Concept: Complimentary Angles for Secant ( Sec ) and Cosecant ( Cosec )
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APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 25 Complementary Angles
Exercise 25 | Q 6.5 | Page 310
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