Ask a New Question

If 0 < theta < pi and cos theta = 0.5, then what is the value of cos (2 theta)?

2 answers

if cos Theta=1/2, then sinTheta=1/2 sqrt3

cos2Theta=cos^2Theta-sin^2Theta

cos2Theta= 1/4 -3/4= - 1/2

Thank you so much!

Ask a New Question or answer this question.

Similar Questions

Multiple Choice (theta) means the symbol 0 with the dash in it.1.)Which expression is equivalent to
1. 2 answers
Multiple ChoiceWhich expression is NOT equivalent to 1? (theta) means 0 with dash in it. A.)sin^2 (theta)+cot^2 (theta) sin^2
1. 0 answers
Suppose that \Theta takes values in [0,1] and its PDF is of the formf_{\Theta }(\theta )= a\theta (1-\theta )^2,\ \ \
1. 1 answer
Justin wants to evaluate 3cot(-5pi/4). Which of the following identities can he use to help him? Select two answers.cot(-theta)
1. 5 answers

more similar questions