`(1-2cos^2A)/(sinAxxcosA)=`

sin^4A-cos^4A=2sin^2A-1=1-2cos^2A=sin^2A-cos^2A

Prove the following identities: (sin+cos A)/(sin A-cos A)+(sin-cos A)/(sin A+cos A)=(2)/(sin^(2)A-cos^(2)A)=(2)/(2sin^(2)A-1)=(2)/(1-2cos^(2)A)

prove that (1-cos2A)/(1+cos2A)=tan^(2)A

Prove that (tanA+cotA)sinAxxcosA=1

Prove: (1-cos^2A)cos e c^2A=1

(sin2A)/(1+cos2A)*(cos A)/(1+cos A)=

(1)/(1-cos A)+(1)/(1+cos A)=2csc^(2)

For A= in (0,pi/4),"if"(1+(cos3A)/(cosA))+(1+(cos6A)/(cos2A))+(1+(cos9A)/(cos3A))+(1+(cos12 A)/(cos4A))=0, then find the value of (csc A - scc 2A).

Prove that: (sin A + cos A)/(sin A - cos A) + (sin A - cos A)/(sin A + cos A) = (2)/(sin^(2)A-cos^(2)A)=(2)/(2sin^(2)A-1)=(2)/(1-2 cos^(2)A) .

Prove the following identities: sin^4A-cos^4A=sin^2A-cos^2A=2sin^2A-1=1-2cos^2A