Find the value of  cot3A-3cotA/3 cot2A-1

Find the value of  cot3A-3cotA/3 cot2A-1

Find the value of  cot3A-3cotA/3 cot2A-1

(a)          cot²2A + tan²A

(b)          tan²2A + cot²A

(c)           tan3A

(d)          cot3A

 Sol:

As we know that: tanA + tanB + tanC = tanA tanB tanC

Sin2A + sin2B + sin2C = 4 sinA sinB sinC

quantitative aptitude
Gkseries: Gkseries.com is a premier website to provide complete solution for online preparation of different competitive exams like UPSC, SBI PO, SBI clerical, PCS, IPS, IAS, IBPS PO, IBPS Clerical exam etc. & other graduate and post-graduate exams. Learn more on about us page
Related Post
  1. Sin⁶ + cos⁶ is equal to
  2. A vessel of 115 litres is filled with milk and water. 70% of milk and 40% of water is taken out of the vessel it is found that the vessel is
  3. What is the average of all the one digit, two digit and three digit natural numbers