Add simple trig functions

Author: Katharine Hyatt

src/internal_rules/bigfloat.jl

@@ -80,3 +80,6 @@ EnzymeRules.@easy_rule(/(a::BigFloat, b::Number), (one(a)/b, -(a/b^2)))
 EnzymeRules.@easy_rule(/(a::Number, b::BigFloat), (one(a)/b, -(a/b^2)))
 EnzymeRules.@easy_rule(/(a::BigFloat, b::BigFloat), (one(a)/b, -(a/b^2)))
 EnzymeRules.@easy_rule(Base.inv(a::BigFloat), (-(one(a)/a^2),))
+EnzymeRules.@easy_rule(Base.sin(a::BigFloat), (cos(a),))
+EnzymeRules.@easy_rule(Base.cos(a::BigFloat), (-sin(a),))
+EnzymeRules.@easy_rule(Base.tan(a::BigFloat), (one(a) + Ω^2,))

test/rules/internal_rules/bigfloat.jl

@@ -26,5 +26,8 @@ using Test
     end
     for TR in (Const, Duplicated), TA in (Const, Duplicated)
         test_forward(inv, TR, (a, TA))
+        test_forward(sin, TR, (a, TA))
+        test_forward(cos, TR, (a, TA))
+        test_forward(tan, TR, (a, TA))
     end
 end