Trigonometry Answers

A vertical tower is 20 m high. A men standing at some distance from the
tower knows that the cosine of the angle of elevation of the top of the tower is 0.53
.How far is he standing from the froot of the tower ?

if secθ - tanθ= p find value of secθ and tanθ

sec(x)+tan(x)=2+squareroot{5} then find sin(x)+cos(x)

If cos(2m) = .11, which of the following is (cos m)2?

A. 0.555
B. 1.11
C. 2.22
D. .0745

If sin a = .25 and cos b = .25, which of the following is sin b/2 + cos a/2 ?

A. 1.60
B. 1.32
C. .26
D. 1.06

Let sin m = .11. Which of the following is sin m/2?

A. .79
B. .78
C. .77
D. .05

sina-sinb/cos a+cos b + cos a-cos b/sin a +sin b

If sin x = 0.20, cos x = .98, sin y = .12, and cos y = .99, which of the following is cos(x + y)?

A. -.94
B. -.95
C. .96
D. .95

If tan A + sec A =L , then prove that (L2+L)/2L = sec A
(* note L2 is L square)

cot 4A = 1/cot 4A