help please

[shy prism]

help please

[mossy veldt]

What have you tried?

[shy prism]

I did.. but, unable to get the answer.. stuck midway

I've expanded cos^2 to (1+cos2x)/2 .. taken 1/2 as common.. simplified the rest

all the sides

and then I'm not sure how to forward with it..

[mossy veldt]

well, let’s not solve it that way

[shy prism]

then, how am I supposed to solve it?

[mossy veldt]

use the formula cos(a+b)

I’m sure you know it

[shy prism]

yeah.. I do

[mossy veldt]

expand and see what you can do

[shy prism]

wait.. cos(a+b)?

But, in question.. it's given as cos^2

not only cos

where am I supposed to apply the formula?

[mossy veldt]

Yes

squared means (cos(something))^2

[shy prism]

i know

[mossy veldt]

Now write cos^2(a+b) as (cos(a)cos(b)-sin(a)sin(b))^2 and try to simplify!

[shy prism]

ohh

ok

I got it!

Thanks a lot!

[mossy veldt]

no problem!

[shy prism]

I put the value of pi/3 as 60 .. nd then I got the answer

Thanks once again😄

[mossy veldt]

nice!

[mossy veldt]

oh also one thing

close the forum if you are done!

[shy prism]

How?

.close