Double and half-angle formulas

Questions (2)

I need to prove that the following is true. Thanks.csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) =
1. 3 answers
2. asked by Dirk
3. 864 views
Can you please help me verify these?>sin7x-sin5x= tanx(cos7x-cos5x) >(1-cosx)cot(1/2x) = sinx >1+tanx tan(x/2) = secx Its very
1. 2 answers
2. asked by Karla
3. 572 views