Trigonometrical...

Solve for , if 2 tan  - sec  -  (2 sin  - 1) = 0, where 0 <  < 90^o.

Find the value of cos 22.5^o cos 67.5^o – sin 22.5^o sin 67.5^o.

If sin (2B - A) = 2 sin (3A - B) = , find the value of 2A - B.

If sin² - 3 cos² = 0, find the value of 2 tan² - sec + 3 and acute angle .

If 3 - 3 cos A - 2 sin² A = 0, then the measure of angle A is

^{_{If 10 sin= 6, then tan+ cot =}}

Find the value of sin 50^o cos 40^o + cos 50^o sin 40^o.

If sec (A - B) = cosec (A + B) = , then the measures of A and B respectively are

If tan²x = 1, then sin 2x is

If A = 15^o, then the value of tan 2A ^. cos 3A ^. sin 4A is

If cos² 60^o + cos² (x + 30)^o = 1 and 0 , the value of `x` is

If tan + cot = 3, then tan² + cot² is equal to

If cos² 45 + cos²x = 1, the measure of x is

If cos 6x = 0 and x is acute, then sin 2x is