SOLUTION: Prove each of the following trigonometric identities. 1) sin x sin 2x + cox x cos 2x = cos x 2) cot x = sin x sin (pi/2 - x) + cos^2 x cot x 3) 2 csc 2x = sec x csc x

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Question 1183638: Prove each of the following trigonometric identities.
1) sin x sin 2x + cox x cos 2x = cos x
2) cot x = sin x sin (pi/2 - x) + cos^2 x cot x
3) 2 csc 2x = sec x csc x

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!
Prove each of the following trigonometric identities.
1)



manipulate left side

..........use

=

= ...factor out

=

=

= ............use

=


2)



manipulate right side

.........use

=.... use

=

=

=

=

=

=


3)



manipulate left side

..................use

= .....simplify

=


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