**Q)** If , then find the value of , where α is in IV quadrant.

**Ans: **

Since,

We know that

Now since, α is in IV quadrant, therefore value of will be negative only.

Now,

**Therefore**

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**Q)** If , then find the value of , where α is in IV quadrant.

**Ans: **

Since,

We know that

Now since, α is in IV quadrant, therefore value of will be negative only.

Now,

**Therefore**

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