Question

if cos theta is equal to 1 then cos 2 theta is equal to​

Answer 1

✨cosθ=1

then

cos²θ=1²=1✨

Answer 2

The value of cos2θ = 1

Correct question : If cosθ = 1 then cos2θ =

Given :

cosθ = 1

To find :

The value of cos2θ

Formula :

cos2θ = 2cos²θ - 1

Solution :

Step 1 of 2 :

Write down the given value

Here it is given that cosθ = 1

Step 2 of 2 :

Calculate the value of cos2θ

cos2θ

= 2cos²θ - 1

= [ 2 × (1)² ] - 1

= 2 - 1

= 1

━━━━━━━━━━━━━━━━

Learn more from Brainly :-

$1.$ Find sin 22 cos 78 +sin 78 cos 22

https://brainly.in/question/8940320

2. Exact value of (sin30°)(tan45°)+(tan30°)(sin60°)=

https://brainly.in/question/8679351

#SPJ3