speaking scientific calculator is one of the amazing speaking calculators in android market.it does your calculations and speaks them out for you.it has almost every calculation used in general and advanced mathematical calculations.
it does trigonometric functions like sin,cos,tan ;;log function,inverse function,square ,square root,etc
it has a great looking high quality layout which automatically customises with device resolution
one of the key features of this app is that it speaks out every input as well as output that is displayed.