Question

Express sec 46° - cos 87° in terms of trigonometric ratios of angles between 0° and 45°.​

Answer 1

Answer:

Step-by-step explanation:cos 78° + sec 78° = cos (90° - 12°) + sec (90° - 12° )

= sin 12° + cosec 12°  

[cos (90 - θ) = sin θ , sec (90 - θ) = cosec θ ]

Hence,  cos 78° + sec 78° = sin 12° + cosec 12°  

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