Question

cos^2(x)+cos^2(2x)=1 then find x​

Answer 1

Answer:

Step-by-step explanation:

cos~2x + cos~4x=1

cos~4x=1-cos~2x

cos~4x=sin~2x

cos~2x • cos~2x= sin~2x

cos~2x= sin~2x/cos~2x

cos~2x=tan~2x

cos~4x=tan~4x

:• tan~2 x + tan~4 x= cos~2 x + cos~4 x=1

for for that neat handwriting tho

Answer 2

Answer:

90

Step-by-step explanation:

put x=90 degree

eqution are verified then solution is 90 degree\