hii guyzz, having trouble with MORE of these trig equations ><""
use the factors of xcubed - ycubed to show that
cos^6x - sin^6x = (1- 1/4sin^2x)cos2x
by the way, this ^means to the power to, and its just to the power of 6, and NOT to the power of 6x if anyone gets confued, the x is like theta
AND
if cosx = (a^2 - m^2)/(a^2 + m^2) and 0<x<pi/2 express tanx and sin2x in terms of a and m
thankyou sooooo much to anyone who can give me some help in these equations, i'm so grateful =D
cos x is also adjacent over hypotenuse in a right triangle, so let's say that the adjacent side is and that the hypotenuse is .
Use the Pythagorean theorem to find the remaining (opposite) side:
Since , we can drop the sign. y = 2am
So,
adjacent side is ,
opposite side is , and
hypotenuse is .
Use to find sin x.
Use or to find tan x.
Use to find sin 2x.
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