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Trigonometry formulas

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Show step by step how we go from the left side to the right side.

asked Dec 22, 2014 in TRIGONOMETRY by anonymous
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Left hand side identity :

1 + cos²x 

Recall the Pythagoras identity : sin2 θ + cos2 θ = 1.

=sin²x + cos²x  + cos²x 

= sin²x + 2cos²x 

= Right hand side identity.

answered Dec 22, 2014 by bradely Mentor

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