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Featured 1 week ago

Featured 1 week ago

Sum of all solutions is

or

or

or

or

or

or

i.e.

or

and in

and their sum is

Featured 5 days ago

Kindly go through the **Explanation.**

**Otherwise,**

Similarly,

From

**as desired!**

Featured 5 days ago

0

Using either calculator or unit circle,

Featured 5 days ago

Given

So

But

Now

Now

Featured 2 days ago

#"using the "color(blue)"half angle formula"#

#â€¢color(white)(x)cos(x/2)=+-sqrt((1+cosx)/2)#

#(x/2)=(3pi)/8rArrx=(3pi)/4#

#rArrcos((3pi)/8)=+-sqrt((1+cos((3pi)/4))/2)#

#(3pi)/8" is in first quadrant "#

#=+sqrt((1-cos(pi/4))/2)#

#=+sqrt((1-1/sqrt2)/2)=+sqrt((1-sqrt2/2)/2)=sqrt((2-sqrt2)/4)#

#rArrcos((3pi)/8)=1/2sqrt(2-sqrt2)#

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