How do you write the expression as the sine, cosine, or tangent of the angle given #(tan25^circ+tan10^circ)/(1-tan25^circtan10^circ)#?
1 Answer
Feb 18, 2017
Explanation:
Using/knowing the
#color(blue)"trigonometric identity"#
#color(red)(bar(ul(|color(white)(2/2)color(black)(tan(x+y)=(tanx+tany)/(1-tanxtany))color(white)(2/2)|)))#
#rArr(tan25^@+tan10^@)/(1-tan25^@tan10^@)#
#=tan(25+10)^@#
#=tan35^@#
