## Sum of finite Cosine Series

In the previous topic we discussed about the method of getting the sum of finite sine series. Now we will extend our learning to cosines. In this topic I will give a three simple...

In the previous topic we discussed about the method of getting the sum of finite sine series. Now we will extend our learning to cosines. In this topic I will give a three simple...

In trigonometry, it is easy to find the sum of finite series of sine of angles using our heroic calculator. What about if we are ask to find an expression to represent such series?...

Weird subsets How many subsets in {m,a,t,h,b,l,o,g,s} have at least one vowel? Comment your answer below. Note: I am the only one who can see your comments. You are only allowed to...

Perfect square How many possible value of x in the set of {1,2,3,…,1000} such that the expression is a perfect square? Comment your answer below. Note: I am the only one who...

Triangles in a triangle Triangle ABC is a right triangle with right angle at B. The legs are of length 15 and 8. Point D is on the hypotenuse of the triangle such...

Sum of tangents Given: Find the value of Comment your answer below. Note: I am the only one who can see your comments. You are only allowed to comment your answer once. Comments...

Square of a Sine What is the sum of sin21+sin22 +. . .+sin289 ? Comment your answer below. Note: I am the only one who can see your comments. You are only...

Prime Roots The x-intercepts of the equation y=x2-30x+k are prime numbers. What is/are the value(s) of K? Comment your answer below. Note: I am the only one who can see your comments....