Question

Prove the following
${ \cos^{2}} \theta(1 + \: {tan}^{2} \theta) \: = \: 1$

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Answer 1

Answer:

see and in the form of image.

>Cos^2+Cos^2Tan^2theta= 1

=>Cos^2+ Cos^2 Sin^2/ Cos^2 theta= 1

=>Cos^2theta +Sin^2 theta =1.

Cos^2 theta

cancel with Cos ^2 theta

=> 1= 1 Hence prove.