Trigonometry Te...

In a right PQR, right-angled at Q, PR – PQ = 2 units and QR = 4 units. What is the measure of PR?

The perimeter of a triangle ABC is 6 times the arithmetic mean of the sines of its angles. If the side b is 2, then the angle B is

If cos( + ) = 0, then sin( - ) can be reduced to

There exists a triangle ABC satisfying the conditions

Which of the following expressions is rational?

If the sides of a triangle are 13, 7, 8 the greatest angle of the triangle is

The value of the expression  is

The value of (tan 1° tan 2° tan 3° ... tan 89°) is

What is the value of sin. cos[tan + cot]?

If cos 9 = sin and 9 < 90°, then the value of tan 5 is

If tan + sec = ; 0 <  <, then  is equal to

Find the value of the following expression:

[cosec (75° + ) – sec (15° – ) – tan (55° + ) + cot (35° – )]

If  is right-angled at C, then the value of cos (A + B) is

If sin A + sin ²A = 1, then the value of the expression (cos²A + cos⁴A) is

If sin A = 1/2, then the value of cot A is

Find the value of cos 30^o . cos 60^o . ------- cos 90^o . cos 220^o.

If sin = cos , then  is equal to

cot + tan equals

In a ΔABC, (b +c) cos A + (c + a) cos B + (a + b) cos C is equal to

If 4 tan  = 3, then  is equal to

The value of sin (45° + ) – cos (45° – ) is equal to

If sin = 1/2 and cos = 1/2, then the value of  is

If sin – cos = 0, then what is the value of (sin⁴ + cos⁴)? [Given ()]

The maximum value of sin x is