# Question #7267c

##### 4 Answers

See below

#### Explanation:

We'll be applying one key trigonometric identity to solve this problem, which is:

**Firstly**, we want to turn the

We plug this in:

Also, note that the ones on both sides of the equation will cancel:

**Secondly,** we want to turn the remaining

We can now plug this in:

**Lastly,** we move the

Now, we add

And there you have it. Note that you could have done this very differently, but as long as you end up at the same answer without doing incorrect math, you should be good.

Hope that helped :)

See the explanation

#### Explanation:

We know ,

Or

Use this value in equation

We get ,

Squaring both sides

Use the value of

Now use the identity in green color.

We get ,

Hence proved.

see below

#### Explanation:

we have,

Expressing

We have,

Or,

Now putting this value in the R.H.S portion of your second equation,we have,

Or,

Hence proved a[ L.H.S=R.H.S]

plugging in the identity,

so,

we've gotta prove that,

Hence Proved.!