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Prove the trigonometric identities?

0 votes
Hello,

There are some questions that I am not sure how to do:

1) secθ - cosθ = sinθ tanθ

2) sin^2θ + 2cos^2θ = 2 - sin^2θ

3) tanθ + cotθ = 1 / (sinθ cosθ)

Thank you.
asked Aug 12, 2014 in TRIGONOMETRY by anonymous

1 Answer

0 votes

Recall the pythageron identity

image

1) Left hand side identity image

image

image

image

image

image

= Right hand side identity.

2) Left hand side identity image

image

image

image

Right hand side identity

3) Left hand side identity image

image

image

image

Right hand side identity

answered Aug 12, 2014 by david Expert

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