Mathematics
Assertion (A): The value of sin2 30° - 2 cos3 60° + 2 tan4 45° is 2.
Reason (R): sin 30° = , cos 60° = , and tan 45° = 1
A is true, but R is false.
A is false, but R is true.
Both A and R are true, and R is the correct reason for A.
Both A and R are true, and R is the incorrect reason for A.
Trigonometrical Ratios
2 Likes
Answer
We know that,
sin 30° = , cos 60° = , and tan 45° = 1.
So, reason (R) is true.
So, assertion (A) is true.
∴ Both A and R are true, and R is the correct reason for A.
Hence, option 3 is the correct option.
Answered By
3 Likes
Related Questions
Statement 1: The angle C of a right angled triangle is 90°, then tan A = cot B.
Statement 2: Since, angle C of triangle ABC = 90°.
∴ ∠A + ∠B = 90° ⇒ ∠A = 90° - ∠B
Both the statements are true.
Both the statements are false.
Statement 1 is true, and statement 2 is false.
Statement 1 is false, and statement 2 is true.
Statement 1: If 3 cos A = 4, sec A = .
Statement 2: 3 cos A = 4 ⇒ cos A = and sec A = .
Both the statements are true.
Both the statements are false.
Statement 1 is true, and statement 2 is false.
Statement 1 is false, and statement 2 is true.
Assertion (A): If A = 30°, the value of 4 sin A sin (60° - A) sin (60° + A) = 1.
Reason (R): 60° - A = 30° and 60° + A = 90°.
A is true, but R is false.
A is false, but R is true.
Both A and R are true, and R is the correct reason for A.
Both A and R are true, and R is the incorrect reason for A.
If find the value of :
(i) 2 - sin2 θ - cos2 θ
(ii)