Question

please please please please I beg please help please give answer i will give 50 points to you please ​

Answer 1

Step-by-step explanation:

1) (a+b)(a-b) = a2 -b2

1-sin^2o = 1/4

cos^2o =1/4 as sin^2o + cos^2 = 1

cos o =+/-(1/2)

o =60 or 120

tano = +/- sqrt(3)

2)cos 3A= sin(40-A)

cos (90-A)=sin A

3A = 90- (40-A)

3A =50+A

2A =50

A =25

3)cos o =5/13

sino =4/13

cosec o =1/sin o=13/4

tan o = sino/coso=4/5