Question

Prove: the following trig identity​

Answer 1

Answer:

Class 10 th,

Chapter 8,

Introduction to trigonometry

Step-by-step explanation:

Check the attachment for your answer. It's an easy one.

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Answer 2

Step-by-step explanation:

There is no sign of theta in keyboard. So I am using A instead of theta.

sin⁴A–cos⁴A

= (sin²A+cos²A)(sin²A–cos²A)

= 1×{(1–cos² A)– cos²A}

= 1– 2cos²A (proved).