Verify the identity.cos 
= 
cos ? - 
sin ?
What will be an ideal response?
cos 
= cos ? cos 
- sin ? sin 
= 
cos ? - 
sin ?.
Mathematics
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Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 350e-0.169t, where t is the time in years? Round your answer to the nearest hundredth year.
A. 34.66 yr B. 59.15 yr C. 38.76 yr D. 4.10 yr
Mathematics
Solve the logarithmic equation.ln x = 6Give your answer in exact form.
A. 6e B. 1,000,000 C. ln 6 D. e6
Mathematics
Given the matrices A and B, find the matrix product AB.A = 
, B = 
Find AB.
A. 
B. 
C. 
D. 
Mathematics
Use Cramer's Rule to solve the following system of linear equations:
A. 
B. 
C. 
D. 
E. 
Mathematics