Prove that Trigonometry Relation #05

Prove that:

An aeroplane is flying at a height of 300 m above the ground
As observed from the top of a 100 m high light house from the sea-level, the angles of depression of two ships
Prove that Trigonometry Relation #04
If 4 tan θ = 3, evaluate
If sin (A + 2B) = √3/2 and cos (A + 4B) = 0, A > B
Amit, standing on a horizontal plane, finds a bird flying at a distance of 200 m
Prove that Trigonometry Relation #02
Prove that Trigonometry Relation #03