prove: SinA TanA= 1-cos^2A/cosA
S soroban Elite Member Joined Jan 28, 2005 Messages 5,586 Nov 8, 2005 #2 Hello, yasaminG! Prove: .\(\displaystyle \sin(A)\cdot\tan(A)\:=\:\frac{1\,-\,\cos^2(A)}{\cos(A)\) Click to expand... The left side is: .\(\displaystyle \sin(A)\cdot\frac{\sin(A)}{\cos(A)}\;=\;\frac{\sin^2(A)}{\cos(A)}\;=\;\frac{1\,-\,\cos^2(A)}{\cos(A)}\)
Hello, yasaminG! Prove: .\(\displaystyle \sin(A)\cdot\tan(A)\:=\:\frac{1\,-\,\cos^2(A)}{\cos(A)\) Click to expand... The left side is: .\(\displaystyle \sin(A)\cdot\frac{\sin(A)}{\cos(A)}\;=\;\frac{\sin^2(A)}{\cos(A)}\;=\;\frac{1\,-\,\cos^2(A)}{\cos(A)}\)
