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'simplify' expression not efficient in Matlab2015

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Kiran Sagar
Kiran Sagar on 21 Feb 2016
Commented: Star Strider on 21 Feb 2016
I used Matlab 2015 to simplify an trigonometric expression, but in vain. It is not able to replace 1-sin^2() with cos^2(). If my memory serves correctly, Matlab2014 was able to do this very efficiently.
Is there a new function that does this in 2015, or we just lost a great feature.
Edit: Inserted Picture

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Answers (1)

Walter Roberson
Walter Roberson on 21 Feb 2016
syms theta
simplify( 1 - sin(theta)^2 )

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Star Strider
Star Strider on 21 Feb 2016
In R2015b:
syms theta
q1 = simplify(1 - sin(theta)^2, 'steps', 10)
q2 = rewrite(1 - sin(theta)^2, 'cos')
q1 =
cos(theta)^2
q2 =
cos(theta)^2

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