first u convert 1+tan^2theta into sec^2theta then using the formula a²-b² then it will be cos²theta then sec²theta and cos²theta get cut with each other and get 1 ..now again using. the formula a²-b² you will get 1-cos²theta which is equal to sin²theta and at last 1+cot²theta = cosec²theta which is get cut by sin²theta and you will get 1 . so 1×1 = 1 ...therefore the ans is 1.
