Q. 375.0( 2 Votes )

Find the value off the following:

cosec (65° + θ) – sec (25° - θ)

Answer :

cosec (65° + θ) – sec (25° - θ)

= sec {90°-(65°+θ)} – sec (25° - θ)


[ cosec θ = sec (90° - θ)]


= sec ( 90° - 65°-θ) – sec (25° - θ)


= sec (25° - θ) - sec (25° - θ)


= 0


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