4 years ago

Find all real square roots of -121.

Mathematics

2 answers:

allsm [11]4 years ago

8 0

Answer:

is that negative numbers if yes their no answer that invalid.

but if positive the answer was 11

mylen [45]4 years ago

4 0

Answer:

Step-by-step explanation:

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Find sin x/2, cos x/2, and tan x/2, if cos x = -12/13, 180 degrees is less than x which is less than 270 degrees

Rashid [163]

Cos x = -12/13
sin x = -sqrt(13^2 - 12^2) / 13 = -5/13
tan x = 5/12

tan x/2 = (1 - cos x) / sin x = 1 - (-12/13) / -5/13 = 25/13 * -13/5 = -5

2sin^2 x/2 = 1 - cos x = 1 - (-12/13) = 25/13
sin^2 x/2 = 25/13 / 2 = 25/26
sin x/2 = 5/√26

sin x/2 / cos x/2 = tan x/2
cos x/2 = sin x/2 / tan x/2 = 5/√26 / -5 = -1/√26

sin x/2 = 5/√26
cos x/2 = -1/√26
tan x/2 = -5

5 0

3 years ago

(tan B /1-cot B) + (cot B/1-tan B)<br>Please help me .Full point.

DaniilM [7]

Answer:

Hope it helps i typed and attached it pic through word :)

Step-by-step explanation:

in the pic !!!