# How do you solve ?

##
#(1-cos8x)/(1+tgx) = 0#

Correct answer is #x=(kπ)/2# or #x=π/4 +kπ#

Correct answer is

##### 1 Answer

Jun 24, 2018

except the 2 values: x = (-pi/4), and x = (3pi)/4

#### Explanation:

Condition

Solve equation (1):

Unit circle gives:

(except when

Specifically,

When k = -1,

When k = 3 -->

When k = 7 --> x = (7pi)/4 = - pi/4 (rejected)