Posted by Kels. on Thursday, March 8, 2012 at 12:50am.
recall that a^3 + b^3 = (a+b)(a^2 - ab + b^2)
cos^3 + sin^3 = (cos+sin)(cos^2 - sin*cos + sin^2)
look easier now?
Related Questions
Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...
equations trig - 1) ctgx+cosx=1+ctgx*cosx 2) sin^4x+cos^4x=1/2 3) (sinx-cosx)^2=...
Trig........ - I need to prove that the following is true. Thanks (cosx / 1-sinx...
Trig - prove the identity (sinX)^6 +(cosX)^6= 1 - 3(sinX)^2 (cosX)^2 sinX^6= ...
Trig....... - I need to prove that the following is true. Thanks (2tanx /1-tan^x...
Simplifying with Trigonometry Identities - Hi, I am a senior in High School ...
Mathematics - Trigonometric Identities - Prove: (tanx)(sinx) / (tanx) + (sinx...
trig - express this in sinx (1/ cscx + cotx )+ (1/cscx- cotx) i got 2sinx is ...
maths - trigonometry - I've asked about this same question before, and ...
Trigonometry Check - Simplify #3: [cosx-sin(90-x)sinx]/[cosx-cos(180-x)tan...
For Further Reading
