sketch a right-angled triangle with hypotenuse 3 and opposite side as 2
by Pythagoras the adjacent side to angle alpha is √5
You should know the definition of the 6 trig ratios in terms of opposite, adjacent and hypotenuse
e.g. tan (alpha)= 2/√5
Given sine of alpha=2/3 and cosine of alpha is less than zero, find the exact value of the other five trigonometric functions.
1 answer
1 answer