so had my AS core 1 exam today - dont think i did very well, bugger. anyway the question is...
You are given that and the angle A is acute. show without using a calculator that
Please explain thoroughly
Alright , it is ok . Firstly , do u know that when you are given the value of a trigo function , ie
you can draw a triangle and find cos A and sin A as well ?
If u do , well , the question tells us that A is an acute ( smaller than 90 ) , so we know that tan A is in the first quadrant and everything is positive here .