Trigonometry (circular functions)

Hi everyone i need help with this badly. I'm hopeless at math and can't seem to figure these questions out. It is for my pre engineering course it is pretty easy stuff but i study by correspondence and teach myself so any help would be very much appreciated!

**1A)** Given cos A=0.2 and sin A=0.98

FIND:

a) sin(180degrees + A)

b) cos(360degrees - A)

c) tan(180degrees + A)

d) cos(180degrees - A)

e) sin(360degrees + A)

**2)** Sketch the graph of y= 15 sin 2x for 0<x<360?

**3)**Draw the graph of y=120cos(6theta-45degrees)?

- what is the amplitude?

- the period?

- the phase shift?

**4)**Given that sin 55degrees = 0.819 and cos20degrees = 0.94,

show how you would use the identities for sin(A(plus or minus)B) and cos(A(plus or minus)B) to find the following:

a) sin 75degrees

b) cos 35 degrees

c) tan 35 degrees

Showing the steps you would follow. NOTE: sin^2theta+cos^2theta=1