scientific calculator fx designed with many powerful features  for engineering . Some of these can greatly reduce the effort to solve problems, while others can be abused in interesting and fun ways. Being able to use these features can also be helpful for students on tests and exams where scientific calculators are allowed but more powerful graphing calculators are not.
it’s like  scientific calculator fx 991ms plus or  scientific calculator fx 100 ms  , and its easy to use with clear design

you can use it offline
 scientific calculator desmos  with log and antilog and shift solve 
EQ7
for gate

enjoy the high quality  calculator (2018) its is scientific calculator latest version with natural display  (real)

you can use this scientific calculator for :
- ti 84 
- ti 30xs 
- ti 84 plus 
- 100 ms 
- 1000 ms 
- fx 991ms plus 100ms 
- fx 100 ms 
-fx 100 ms 
- 4500 
- 995 
- 991 es plus 
- 991ms 
- 991 es 
- 991 

SCIENTIFIC CALCULATOR
• Trigonometric functions sin π/2, cos 30°, ...
• Square root, cube and higher roots (hold √ key)
• Exponent or power, use x^ key, (x^2)
• Hyperbolic functions sinh, cosh, tanh, ... (hold "e" key to switch)
• Scientific and engineering notation (enable in menu)
• Inverse functions (hold direct function key)
• Complex numbers, all functions support complex arguments
• Derivatives sin x' = cos x, ... (hold x^ key)
• Save and load history
• Percent mode
• Binary, octal and hexadecimal numbers, 0b1010, 0o123, 0xABC

GRAPHING CALCULATOR
• Multiple functions graphing
• Parametric functions, enter each on new line (x=cos t, y=sin t)
• Implicit functions up to 2nd degree (ellipse 2x^2+3y^2=1, etc.)
• Polar graphs (r=cos2θ)
• Function roots and critical points.
• Graph intersections
• Pinch to zoom
• Tracing function values and slopes
• Slide to scroll
• Fullscreen graphs (PRO)
• Function tables
• Save graphs as images
• 3D graphs (PRO)

• Save tables as csv

FRACTION CALCULATOR
• Simple and complex fractions 1/2 + 1/3 = 5/6
• Use parentheses (1+2)/(3+4)=3/7
• Mixed numbers, use space to enter values 3 1/2

ALGEBRA CALCULATOR
• Systems of linear equations, write one equation per line, x1+x2=1, x1-x2=2
• Linear equations x+1=2 -> x=1
• Quadratic equations x^2-1=0 -> x=-1,1
• Linear and quadratic inequalities
• Approximate roots of higher polynomials
• Polynomial long division
• Polynomial expansion, factoring

PROBABILITY AND STATISTICS
• Sample A=[1 2 3 4 5]
• Combinations nCr(5,2)=10
• Permutations nPr(5,2)=20
• Sample B=[2 3 4 5 6]
• Sum sum(A) = 15
• Average avg(A) = 3
• Median median(A) = 3
• Correlation corr(A,B) = 1
• Sample variance var(A) = 2.5
• Population variance varp(A) = 2
• Standard deviation stdev(A) = 1.58..., stdevp(A) = 1.41...
• Covariance cov(A,B) = 2.5
• Hold n! key to enter functions, double tap dot to enter comma


MATRIX CALCULATOR
• Vector cross product, dot product (hold *) and norm
• Matrix and vector arithmetic operations
• Matrix determinant, inverse, transpose and trace functions

LIBRARY
• Physical constants (PRO)
• Save expressions for future reference
• User defined constants and functions (PRO)


[Disclaimer]
Please note in advance that Appsys is not responsible for any damage or lost profits caused by the use of this software, or any claims from third parties.

// Option A //

To download Scientific Calculator- Simple mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Scientific Calculator- Simple mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Scientific Calculator- Simple from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Scientific Calculator- Simple in HappyMod App.