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Which of the following is incorrect? A cos 20 = cos² 0- sin² 0 B C cos 2012 sin² 0 C cos 20-1- cos² 0 D None of these

Question

Which of the following is incorrect? A cos 20 = cos² 0- sin² 0 B C cos 2012 sin² 0 C cos 20-1- cos² 0 D None of these
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Solution 1

To determine which of the given options is incorrect, we will analyze each option step by step.

Option A: cos 20 = cos² 0 - sin² 0 This is a trigonometric identity known as the cosine double-angle formula. It states that cos 2θ = cos² θ - sin² θ. However, in this option, we have cos 20 on the left Knowee AI is a powerful AI-powered study tool designed to help you to solve study problem.

Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
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