Trigonometrical...

Find the value of x such that 2sin² 30^o . cos² 45^o + 3cot² 45^o . sec² 60^o - xcosec² 30^o . sec² 45^o + tan² 30^o . sin² 45^o = 1.

If sin (2A - 7B) =  and cos (A + 4B) = , then (A + B) is

Find , if 5 sec⁴ - 6 = 7 sec², where 0 <  < 90^o.

If sin A = cos B, then which of the following relations is true?

The value of tan10⁰. tan 20⁰ . tan 70⁰ . tan 80⁰ is

Find the value of  - sin² 25^o + cos² 65^o - 5 cot² 45^o + tan² 60^o.

Evaluate:  +  –  –

Evaluate

Find the value of  .

If tan x = cot 45^o, find the value of x.

Find the value of tan 1^o tan 2^o tan 3^o … tan 89^o.

Find the value of .

Solve: sec 40^o sin 50^o + cos 40^o cosec 50^o

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

Find the value of sin 43^o cos 47^o + cos 43^o sin 47^o.