Question

Express cot85° +cos75° in the terms of trigonometric ratios of angles between 0° and 45° ​

Answer 1

Question:-

Express cot85° +cos75° in the terms of trigonometric ratios of angles between 0° and 45°

${\blue{\underline{\underline{\bold{Answer:-}}}}}$

cot 85° + cos 75°

= cot 85° = cot(90°-5°)

cos 75° = cos (90°-15°)

cot 85° + cos 75°

=cot (90°-5°) + cos (90°-15°)

Since, cot ( 90° -A) = tan A

and cos (90° - A) = sin A

=tan 5° + sin 15°

Answer 2

Answer:

tan 5°+15 °sin

Step-by-step explanation: