rodelroberto
rodelroberto
03-11-2015
Mathematics
contestada
Verify
(2cos2x)/(sin2x) =cotx - tanx
Respuesta :
crisforp
crisforp
03-11-2015
cos2x = (cosx)^2 - (sinx)^2;
sin2x = 2sinxcosx;
Then, (2cos2x)/(sin2x) =2[ (cosx)^2 - (sinx)^2 ] / (2sinxcosx) = [ (cosx)^2 - (sinx)^2 ] / (sinxcosx) = (cosx)^2 / (sinxcosx) - (sinx)^2 / (sinxcosx) = cosx/sinx - sinx/cosx = cotx - tanx;
Answer Link
VER TODAS LAS RESPUESTAS ( 52+ )
Otras preguntas
An aquarium 4 m long, 1 m wide, and 1 m deep is full of water. Find the work needed to pump half of the water out of the aquarium. (Use 9.8 m/s2 for g and the f
Abraham is the father of Judaism. How was his new religion different from most other religions during this period in history?
Can someone help my little sister with her quiz? She gotta have it turned in by midnight!! So we need answers asap!!
PLS help ASAp only available until 11:59
Write the two consecutive integers between which the given rational liesa)-5/11;___;____b)-21/5_____;_____c)17/6______;_____d)-37/5;______;_____
Help major grade Help
Read the sentences carefully. What do you think they mean? God created life, but He did so using natural processes which are open to scientific investigation. S
What is the area of the obtuse triangle below? 19 11 O A. 99 sq. units OB. 10 sq. units O C. 49.5 sq. units O D. 20.5 sq. units
Do all squares have all right angles?
The central angle of arc ST is 70 degrees. What is the measure of an inscribed angle whose endpoints are points S and T?
