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diff --git a/src/sage/interfaces/maxima_abstract.py b/src/sage/interfaces/maxima_abstract.py
index 961c20aaac..3d601d8939 100644
--- a/src/sage/interfaces/maxima_abstract.py
+++ b/src/sage/interfaces/maxima_abstract.py
@@ -1743,7 +1743,7 @@ class MaximaAbstractElement(ExtraTabCompletion, InterfaceElement):
sage: y,d = var('y,d')
sage: f = function('f')
sage: latex(maxima(derivative(f(x*y), x)))
- \left(\left.{{{\it \partial}}\over{{\it \partial}\, {\it t_0}}}\,f\left({\it t_0}\right) \right|_{{\it t_0}={\it x}\, {\it y}}\right)\,{\it y}
+ \left(\left.{{{\it \partial}}\over{{\it \partial}\, {\it t}_{0}}}\,f\left({\it t}_{0}\right) \right|_{{\it t}_{0}={\it x}\, {\it y}}\right)\,{\it y}
sage: latex(maxima(derivative(f(x,y,d), d,x,x,y)))
{{{\it \partial}^4}\over{{\it \partial}\,{\it d}\, {\it \partial}\,{\it x}^2\,{\it \partial}\, {\it y}}}\,f\left({\it x} , {\it y} , {\it d}\right)
sage: latex(maxima(d/(d-2)))
diff --git a/src/sage/manifolds/differentiable/metric.py b/src/sage/manifolds/differentiable/metric.py
index 3cd6ad3235..1e18af1a6b 100644
--- a/src/sage/manifolds/differentiable/metric.py
+++ b/src/sage/manifolds/differentiable/metric.py
@@ -993,7 +993,7 @@ class PseudoRiemannianMetric(TensorField):
2-dimensional differentiable manifold S^2
sage: g.riemann()[:]
[[[[0, 0], [0, 0]], [[0, sin(th)^2], [-sin(th)^2, 0]]],
- [[[0, (cos(th)^2 - 1)/sin(th)^2], [1, 0]], [[0, 0], [0, 0]]]]
+ [[[0, -1], [1, 0]], [[0, 0], [0, 0]]]]
In dimension 2, the Riemann tensor can be expressed entirely in terms of
the Ricci scalar `r`:
diff --git a/src/sage/symbolic/expression.pyx b/src/sage/symbolic/expression.pyx
index dfb8751467..27402e54ab 100644
--- a/src/sage/symbolic/expression.pyx
+++ b/src/sage/symbolic/expression.pyx
@@ -7154,7 +7154,7 @@ cdef class Expression(CommutativeRingElement):
sage: ex = lcm(sin(x)^2 - 1, sin(x)^2 + sin(x)); ex
(sin(x)^2 + sin(x))*(sin(x)^2 - 1)/(sin(x) + 1)
sage: ex.simplify_full()
- -cos(x)^2*sin(x)
+ sin(x)^3 - sin(x)
TESTS:
@@ -10004,7 +10004,7 @@ cdef class Expression(CommutativeRingElement):
sage: f=tan(3*x)
sage: f.simplify_trig()
- (4*cos(x)^2 - 1)*sin(x)/(4*cos(x)^3 - 3*cos(x))
+ -(4*cos(x)^2 - 1)*sin(x)/(4*cos(x)*sin(x)^2 - cos(x))
sage: f.simplify_trig(False)
sin(3*x)/cos(3*x)
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