eXpress cot85 +cos75in terms of trigonometric ratio of angle between 0 – InterviewSolution

1.

eXpress cot85 +cos75in terms of trigonometric ratio of angle between 0 and 45 degree

Answer»

cot (85°) + cos(75°)

Cot 85°+Cos75°

Use formula

cot(90°- A)=tan(A) cos(90°- A)= sin(A)

cot(90°-5°)+cos(90°-15°)

tan 5° + sin 15°

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