Trig & Exponential Implementation

[phoebewong]

Implement for trig (sin, cos) and exponential

• [x] Sine

• [x] Cosine

• [x] Exponential

• [ ] Need to make sure it works with numpy/math such that they are not overloaded.

[phoebewong]

TF has let me know that we should also do:

• [x] log10

• [x] log2

• [x] loge

• [x] sqrt