Question

Express in terms of t- ratios of angles between 0 and 45 a,tan 72+sec 65 b, cosec 81+cot 75

Answer 1

Answer:

a).tan 72°+sec 65°

72°=90°-12° 65°=90°-25°

tan 72°=tan(90°-12°)=cot 12°

sec 65=sec (90°-25°)=cosec 25°

= cot 12° + cosec 25°