Question

Suppose A is an acute angle, and sin A= 4/5, cos A= 3/5

Answer 1

See below for answers

Explanation:

`\sin(2A)=2\sin A\cos A=2((4)/(5))((3)/(5))=2((12)/(25))=(24)/(25)`

`\cos(2A)=\cos^2A-\sin^2A=((3)/(5))^2-((4)/(5))^2=(9)/(25)-(16)/(25)=-(7)/(25)`