Use tables to find cosine of 2° 4’

Numerical

cos 2° 4’ = 0.9994 − 0.0001 = 0.9993

shaalaa.com

Is there an error in this question or solution?

Chapter 21: Trigonometrical Identities - Exercise 21 (D) [Page 331]

Chapter 21 Trigonometrical Identities
Exercise 21 (D) | Q 2 (i) | Page 331

If sec 4A = cosec (A− 20°), where 4A is an acute angle, find the value of A.

Solve.
`sec75/(cosec15)`

Solve.
sin42° sin48° - cos42° cos48°

Use tables to find the acute angle θ, if the value of cos θ is 0.9848

Write the maximum and minimum values of cos θ.

If 5θ and 4θ are acute angles satisfying sin 5θ = cos 4θ, then 2 sin 3θ −\[\sqrt{3} \tan 3\theta\] is equal to

If A, B and C are interior angles of a triangle ABC, then \[\sin \left( \frac{B + C}{2} \right) =\]

The value of 3 sin 70° sec 20° + 2 sin 49° sec 51° is

The value of tan 1° tan 2° tan 3°…. tan 89° is

In ∆ABC, `sqrt(2)`AC = BC, sin A = 1, sin²A + sin²B + sin²C = 2, then ∠A = ?, ∠B = ?, ∠C = ?