'simplify' expression not efficient in Matlab2015

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

Answer 1

[Walter Roberson]

syms theta
simplify( 1 - sin(theta)^2 )

[Kiran Sagar]

If I do that, I get the following:

[Star Strider]

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