y = f (t) is the solution of the following diff. equation. y"+ y = tan x → homogenous solutions are y, and y, y(t)=(homogen part solution)+(nonhomogenous part solution) nonhomogenous part solution = u,y1 +U2Y2 in order to find u, and u, ,if we use the variation of parameters method, we write two equations: 1→u'y; +u, y, = 0 2 → u'v + u, y = .?... .... what is written instead of '...?...' in equation (2)?

Q: VERIFY THE IDENTITY

A:

Q: Prove sin(x+y)cos(x-y) = sinx/secx + cosy/cscy

A: I hope this can help you.

Q: Verify: 1. (sinx – cosx)² – 1 = -sin2x %3D

A: We can verify the statement as below

Limits

When it comes to calculus, limits are considered to be a very important topic of discussion. The main importance of limit lies in expressing the value of a function as it gets closer to a certain value. Also, limits can help you to understand other topics, such as continuity and differentiability better. In a broader sense, every calculus notion is a limit. Other branches of calculus have also been derived from limits.