- Find the exact value of cos(a-b) if sin a = 1/3, sin b = 3/4 in quadrant 2?

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1+tan²x×(sin²-1)
Can someone help? A sample of P-33 has an activity of 0.200 Curies. How long will it take for the activity of the sample to drop to 0.0354 Curies? Hshdbznjsjsnbxbx? Help with hypothesis in the format "If, then, because" when my experiment is based on bacteria identification? If 2x^2+6>7x,prove that |4x-7|>1?