Consider the following: (A) Maximum value of (SinA + CosA) is equal to 1. (B) Minimum value of (TanA CosecA) is equal to 0. (C) Minimum value of (2Tan2A + Cot2A) is equal to √2. Which of the above is/are not correct?

Consider the following: (A) Maximum value of (SinA + CosA) is equal to 1. (B) Minimum value of (TanA CosecA) is equal to 0. (C) Minimum value of (2Tan2A + Cot2A) is equal to √2. Which of the above is/are not correct? Correct Answer A, B and C

(A)

Maximum value of (SinA + CosA) will be at A = 45°

⇒ Maximum value = Sin45° + Cos45° = 1/√2 + 1/√2 = √2

A is not correct.

(B)

(TanA CosecA) = SinA/CosA × 1/SinA = SecA

Minimum value of SecA = - infinity

Hence, B is not correct.

(C)

Minimum value of (2Tan²A + Cot²A):

= 2√(2 × 1) = 2√2

⇒ C is not correct.

Hence, A, B and C is the answer