Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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![### Verifying Trigonometric Identities
In the following problem, we are asked to verify the trigonometric identity:
\[ \sec^2 x + \tan^2 x = 1 + 2 \tan^2 x \]
We are provided with four statements and need to determine which one correctly establishes the given identity:
1. \( \sec^2 x + \tan^2 x = (1 - \tan^2 x) + \tan^2 x = 1 + 2 \tan^2 x \)
2. \( \sec^2 x + \tan^2 x = 1 = 1 + 2 \tan^2 x \) (Correct Answer)
3. \( \sec^2 x + \tan^2 x = (1 + \tan^2 x) + \tan^2 x = 1 + 2 \tan^2 x \)
4. \( \sec^2 x + \tan^2 x = (\tan^2 x - 1) + \tan^2 x = 1 + 2 \tan^2 x \)
From these expressions, let's analyze each option to determine the correct one:
- **Option A**: This statement simplifies \(\sec^2 x + \tan^2 x\) to \((1 - \tan^2 x) + \tan^2 x\), which does not lead to the given identity.
- **Option B**: This directly states the correct identity, \(\sec^2 x + \tan^2 x = 1\), which matches the given form of the identity, \(1 + 2 \tan^2 x\). (Correct Answer)
- **Option C**: The expression \( \sec^2 x + \tan^2 x = (1 + \tan^2 x) + \tan^2 x\) simplifies to \(1 + 2 \tan^2 x\), but it does not properly establish the transformation from \(\sec^2 x\).
- **Option D**: Similarly, this expression \(\sec^2 x + \tan^2 x = (\tan^2 x - 1) + \tan^2 x\) simplifies, but it does not appropriately verify the identity.
Thus, the correct way to establish the identity is given by option B. When simplified, it shows the transformation leading to \(1 + 2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8120ccba-3e59-4a0a-abb6-8f6773892d35%2F6b9974dc-029d-47e9-9e75-e4de5b62fdee%2Ffi3mjc4_reoriented.jpeg&w=3840&q=75)
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