Question

cos²@(1+tan²@)=1
prove that​

Answer 1

Answer:

to prove -

cos {}^{2}(1 + tan {}^{2} ) = 1

substitute

1 + tan {}^{2}  

with

sec {}^{2}  

according to the identity....

and cos × sec = 1

therefore

cos { }^{2} \times sec {}^{2}  

= 1

Answer 2

Answer:

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