Question

If cos tita =1 then cos 2 tita​

Answer 1

Answer:

1

Step-by-step explanation:

cos {theta+theta}=cos theta * cos theta -sin theta* sin theta

cos theta =1 given

cos theta =cos 0 degrees

theta=0

cos theta +theta =cos 0 * cos 0 - sin 0 sin 0

                           =1 * 1-0 *0

                           =1-0

=1

Answer 2

answer:

• cos2theetha
• 2×(cos theeta)²-1
• 2×1²-1
• 2×1-1
• 2