UPSC CDS 1 2023 Math Paper

© examsiri.com

Question : 46 of 100

Marks: +1, -0

Consider the following:
1. cos4⁡θ−sin‌4⁡θ=‌

2‌tan‌⁡θ‌

1−tan‌2⁡θ

,0<θ<‌

π‌

2

2. co sec⁡θ+cot⁡θ=‌

1

co sec‌⁡θ‌−cot‌⁡θ‌} ,0<θ<‌

π‌

2

3. cos2⁡θ−sin‌2⁡θ=‌

1−tan‌2⁡θ‌

1‌+‌tan‌2⁡θ

,0<θ<‌

π‌

2

Which of the above equations are identities?

1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3

Go to Question:

Prev Question

Next Question