In ΔABC, the line joining the circumcentre to the incentre is parallel to BC, then cos B + cos C is equal to
Find the radian measure corresponding to – 370 30’.
The minute hand of a clock is 10 cm long. How far does the tip of the hand move in 20 minutes?
A rail road curve is to be laid out on a circle. What radius should be used if the track is to change direction by 250 in a distance of 40 meters?
Find the minimum and maximum values of sin2 θ + cos2 θ
Evaluate: sin (15600).
Evaluate: cos (–30300).
If sin = 8/17 and cos β = 9/41, find sin (θ + β), cos (θ + β), sin (θ – β) and cos (θ – β), where θ is an obtuse angle and β is an acute angle.