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Trigonometric Expressions ~ verify if true or not true: |
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1. cos(3b)= cos^3 b - 3sin^2 bcosb |
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2.
sin^2(4x) - sin^2 (2x) = sin(2x)sin(6x) |
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3. sec^4
(theta) - tan^4 (theta) = 1 + 2tan^2 (theta) |
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4. 2 + cos^2
x - 3cos^4 x = sin^2 x(2 + 3cos^2 x( |
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5. 1/cotx
+ 1 + 1/tanx + 1 = 1 |
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6.
cos(theta)cot(theta)/1-sin(theta) -1 = csc(theta) |