Solving differentiation using casio fx 991ms || differentials at a point

[@igxniisan6996]

I have a serious problem.. I tried differentiating cosine of X, at X = 30°
I know d(cosX)dx = -sinX, so the answer should be equal to -1/2 IF I'M USING THE CALCULATOR IN DEGREE MODE, but the answer that it's showing is, "-8.72664626E-3"
I want an explanation to why it's showing mw wrong answer even when I'm using my calculator in degree mode

[@deepnight8828]

Same problem

[@ethankisang2133]

I have realised that if you convert the 30 degrees to radian first, using the formula 2PI=360 degrees, it works perfectly

[@rsrjn4471]

Thanks

[@TethlyDev]

thanks 🌸

[@joyineverything2518]

Most welcome 😊

[@faithnjambi]

My calculator doesn't have the /dx the part

[@itsankyyyy]

Same

[@RahulYadav-ou4dl]

Computer mode par kr do uske baad aa jayega

[@amarmkulkarni]

@@RahulYadav-ou4dl thanks, solved the issue

[@ayeshaamirah7847]

Then why r u seeing this vid? -_-

[@vasantsalunkhe7205]

Reset kar

[@leepakshi2846]

Can't we use it without mentioning values?

[@joyineverything2518]

Scientific calculator cannot give you answers in terms of variables, so you can only differentiate with some values

[@leepakshi2846]

@@joyineverything2518 ok thanks.

[@joyineverything2518]

Most welcome 😊

[@manishdimber6954]

Hi

[@joyineverything2518]

Hello

[@PingpongPoof-c3r]

Thanks

[@joyineverything2518]

Most welcome 😊