Question #df465 Trigonometry Trigonometric Identities and Equations Proving Identities 1 Answer P dilip_k Feb 11, 2017 #LHS=cos(3a+a)# #=cos(2xx2a)# #=2cos^2 2a-1# #=2(2cos^2a-1)^2-1# #=2(4cos^4a-4cos^2a+1)-1# #=8cos^4a-8cos^2a+2-1# #=1-8cos^2a+8cos^4a=RHS# Proved Answer link Related questions What does it mean to prove a trigonometric identity? How do you prove #\csc \theta \times \tan \theta = \sec \theta#? How do you prove #(1-\cos^2 x)(1+\cot^2 x) = 1#? How do you show that #2 \sin x \cos x = \sin 2x#? is true for #(5pi)/6#? How do you prove that #sec xcot x = csc x#? How do you prove that #cos 2x(1 + tan 2x) = 1#? How do you prove that #(2sinx)/[secx(cos4x-sin4x)]=tan2x#? How do you verify the identity: #-cotx =(sin3x+sinx)/(cos3x-cosx)#? How do you prove that #(tanx+cosx)/(1+sinx)=secx#? How do you prove the identity #(sinx - cosx)/(sinx + cosx) = (2sin^2x-1)/(1+2sinxcosx)#? See all questions in Proving Identities Impact of this question 909 views around the world You can reuse this answer Creative Commons License