but i asked to use cos2x proofing by cosx... i tried this way,,, cos2x=2cos^2(x)-1, and then expand, finally i stacked up.... please give me a solution????
but i asked to use cos2x proofing by cosx... i tried this way,,, cos2x=2cos^2(x)-1, and then expand, finally i stacked up.... please give me a solution????
sheesh
we need to reduce the sin and cos terms that involve h further so we can use known limits
How can i prove cos2x derivation using cos x by basic derivation proof.... like (limit and delta(x) delta(y))
It depends on what you already know. Are you allowed to use the Chain Rule? If so, you can prove by first principles and then apply the chain rule. If you really wanted to, you could prove by first principles, then remember and use the chain rule from there...