Anonym
Anonym
06-08-2014
Mathematics
Answered
cos^2 2x−cos^2 6x=sin4x sin8x
please help me prove it
Answer :
Everest2017
Everest2017
06-08-2014
Cos² 2x = (1+cos 4x )/2
cos² 6x = (1+cos 12x)/2
subtract to get 1/2 (cos 4x - cos 12x )
= 1/2 (2 sin 4x sin 8x ) as cos A - cos B = 2 [ sin (A+B)/2 sin (A-B)/2 ]
so the answer
Answer Link
VIEW ALL ANSWERS ( 19+ )
Other Questions
Marta writes a letter to a client announcing her company's move to a new building. Her letter ends with the words "Enclosed please find a copy of our new office
The object has 4 cubes. Each cube has 6 faces. So the number of faces is: 6 x 4 = 24 There are 3 places where the faces overlap so subtract 3 x 2, or 6 faces.
The legendary HarlemRenaissance leadersBooker T. Washingtonand W.E.B. Dubois hadvery different visionsfor the future of blackpeople in Americansociety.1. Do you
Write necessary condition for exact equation and solution also write the integrating factor and solution of a linear equation
Discuss the benefits of purchasing's involvement in legal spend at Gensin.
Oceanic to oceanic plate convergence will produce deep ocean trenches and parallel volcanic peaks. a. Trueb. False
Define and describe the different types of risk factors.
Comprehension QuestionsLong Way Down - Jason ReynoldsLONGJASONPopsName Dulce rendezWAY DOWNREYNOLDSFloor 4As the elevator arrives on the fourth floor, the smoke
Which new deal program, which is in existence today, provided assistance to the elderly, the orphaned, disabled, and unemployed?
5. Punjab,E. Unscramble the following jumbled words.1. RHUTPAMABRA2. RATUTRASHPDE3. AYNAHRA4. ETWS ENBALGBRA