`cos^2(73)^@+cos^2(47)^@+cos73^@cos47^@=?`

Write True or False : Value of (sin43^@ cos 47^@+ cos43^@sin 47^@) is 2.

What is the value of cos46^@ cos 47^@ cos48^@ cos49^@ cos50^@ ..................cos135^@

cos45^(@)*cos46^(@)*cos47^(@)*cos135^(@)=

sin47^(@)+cos77^(@)=cos17^(@)

What is the value of cos46^(@)cos47^(@)cos48^(@)cos49^(@)cos50^(@)...cos135^(@) ?

Evaluate: (i) (sin^2 63^@+sin^2 27^@)/(cos^2 17^@+cos^2 73^@) (ii) sin 25^@ cos 65^@+cos 25^@sin 65^@

The value of (sin43^(@)cos47^(@)+cos43^(@)sin47^(@)) is

The value of (sin43^(@) Cos47^(@) + cos43^(@) sin47^(@)) is …….. .

The value of sin^2 64^@+cos64^@ sin26^@+2cos43^@ cosec47^@ is : sin^2 64^@+cos64^@ sin26^@+2cos43^@ cosec47^@ का मान ज्ञात करें ।

Without using trigonometric tables, prove that : (i) sin 43^@cos47^@+cos43^@ sin 47^@=1 (ii) cos 38^@cos 52^@-sin 52^@=0 (iii) sec 50^@sin40^@+cos40^@cosec 50^@=2 (iv) sec 70 ^@sin 20^@-cos 20^@-cosec 70^@=0