Question

find the value of cot 75 degrees​

Answer 1

Step-by-step explanation:

Solution :

tan 75° = tan (45° + 30°)

= (tan 45° + tan 30°)/ (1 - tan 45° tan 30°)

tan 15° = cot (90° - 15°)

tan 15° = cot 75°

tan 15° = tan (45° - 30°)

tan 75° + cot 75° = 2 + √3 + 2 - √3.

tan 75° + cot 75° = 4.

= cosA cosB cosC - sinA sinB cosC - cosB cosC cosA + sinB sinC cosA.