Prove that.
(sinA-sin5A+sin9A-sin13A)/(cosA-cos5A-cos9A+cos13A)= cot4A
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I will tell you a short trick by taking the known values of angles.
Assume A = 30,45,60,90 any one of this.
Put value of A in both sides of the equation and check if generated answer is same.
This is basically a trick to solve this type of questions.
Hope it helps.
Assume A = 30,45,60,90 any one of this.
Put value of A in both sides of the equation and check if generated answer is same.
This is basically a trick to solve this type of questions.
Hope it helps.
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