Prove Yourself

Find cos(a-t) given sina=2/3 and sint=-1/3 reedit

Evaluate sin(13pi/12) Exactly reedit

simplify (tan100+tan80)/(1-tan100tan80) reedit

Find tan(-105) exactly reedit

Evaluate cos40cos50-sin40sin50 reedit

Prove (1-cosx)/(1+cosx)=(cotx-cscx)^2 reedit

Find cos75 exactly reedit

prove (2sinx+cosx)^2+(2cosx sinx)^2=5 reedit

Prove (1-cosx)/(1+cosx)=(cscx)^2-2cscxcotx+(cotx)^2 reedit

Prove cosx/secx+sinx/cscx=(secx)^2-(tanx)^2 reedit

Prove the Second Two Half Angle Identities for Tangent

Find tan(s+t) given cost=-3/5 and coss= 8/17 s&t in Q3

Prove sin(x-y)/sin(y+x)=(tanx-tany)/(tanx+tany)

Prove sin(a-b)/sinb+cos(a-b)/cosb=sina/(sinbcosb)

Prove tan(x-y)-tan(y-x)=2(tanx-tany)/(1+tanxtany)

Prove tanx(cosx)^2=(2tanx(cosx)^2-tanx)-(1-(tanx)^2)

Evaluate sin2x given sinx=2/5 and cosx less than 0

Prove cos2x=(2-(secx)^2)/secx

Prove (sinx+cosx)^2=sin2x+1

Evaluate sinx Given a Half Angle and Quadrant

Find sin15 Exactly Using Half Angle

Evaluate tan(x/2) given tanx

Prove (sec(x/2))^ 2=2/(1+cosx)

Prove sin4x=4sinxcosx-8(sinx)^3cosx

Distance From Pitcher to First and Second; Law of Cosine

Proof of the Half Angle Identity

Proof of cos2x=(cosx)^2-(sinx)^2=2(cosx)^2 1=1-2(sinx)^2

Proof sin2x=2sinxcosx

Proof of cos(A+B)=cosAcosB-sinAsinB using cos(A-B)

Proof of the tan(A+B)

Proof of sin(A+B)=sinAcosB+cosAsinB

Prove the Cofunction Identities using the cos(A-B)

Proof of the Cofunction Identity using Right Triangle Trigonometry

Proof cos(A-B)=cosAcosB+sinAsinB

Carbon Dating an Application of Logarithms

Derivation of the Pythagorean Trigonometric Identities

Proving trig identities 1.mov

Proving identities 2.2

prove trig identities level 2.3.mov

Prove Identities 2.4.mov

Evaluate a Formula to Find The Remaining Variable 4 Examples