How do you use the fundamental identities to prove other identities? Trigonometry Trigonometric Identities and Equations Fundamental Identities 1 Answer Kevin B. Feb 22, 2015 Divide the fundamental identity sin2x+cos2x=1 by sin2x or cos2x to derive the other two: sin2xsin2x+cos2xsin2x=1sin2x 1+cot2x=csc2x sin2xcos2x+cos2xcos2x=1cos2x tan2x+1=sec2x Answer link Related questions How do you use the fundamental trigonometric identities to determine the simplified form of the... How do you apply the fundamental identities to values of θ and show that they are true? What are even and odd functions? Is sine, cosine, tangent functions odd or even? How do you simplify secxcos(π2−x)? If cscz=178 and cosz=−1517, then how do you find cotz? How do you simplify sin4θ−cos4θsin2θ−cos2θ using... How do you prove that tangent is an odd function? How do you prove that sec(π3)tan(π3)=2√3? How do you simplify cos4x−cos2xsin4x+sin2x? See all questions in Fundamental Identities Impact of this question 11157 views around the world You can reuse this answer Creative Commons License