Trigonometric Expressions

1.Simplify:

trigonometria4
Solution:
trigonometria4r

2.Simplify:

trigonometria5
Solution:
trigonometria5r

3.Simplify:

trigonometria6
Solution:
trigonometria6r

4.Simplify:

(1 + tgx)2 + (1 – tgx)2
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5.Simplify:

trigonometria8
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6.Simplify:

trigonometria9
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7. Simplify:

trigonometria10
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8.Prove the identity:

trigonometria11
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9.Prove the identity:

trigonometria12
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10.Prove the identity:

trigonometria13
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11.Prove the identity:

trigonometria14
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12.Prove the identity:

trigonometria15
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