`4cos ^3 45^@ - 3cos45^@ + sin45^@`​

What is the value of sin^2 45^@+ cos^2 45^@ ? sin^2 45^@+ cos^2 45^@ का मान क्या है ?

cos 45^(@)-sin 45^(@)=?

What is the value of 4(sin^4 30^@ + cos^4 60^@) -3(cos^2 45^@ - sin^2 90^@) ?

Find the value of the following (i) tan 60^@ xx cos 30^@ (ii) sin 45^@ * cos 45^@ – sin^2 30^@ (iii) 2 sin 45^@* cos 45^@*tan 45^@ (iv) cos 30^@* cos 45^@ – sin 30^@* sin 45^@ (v) tan 30^@* sec 45^@ + tan 60^@* sec 30^@

Prove that: cos(45^(@)-A)cos(45^(@)-B)-sin(45^(@)-A)sin(45^(@)-B)=sin(A+B)

2sin45^(@)cos45^(@)

The value of 152 ( sin 30^@ + 2cos^2 45^@ + 3 sin 30^@ + 4 cos^2 45^@ + …+ 17 sin30^@ + 18 cos^2 45^@) is

Prove that: i) sin(A+B)cos(A-B)-cos(A+B)sin(A-B)=sin2B ii) cos(45^(@)-A)cos(45^(@)-B)-sin(45^(@)-A)sin(45^(@)-B)=sin(A+B)

If A=sin 44^(@)+cos44^(@), B=sin45^(@)+ cos45^(@) and C= sin46^(@)+cos 46^(@) . Then, correct option(s) is/are

Consider the following I. (cot 30^@+1)/(cot30^@ -1) = 2 (cos300^@ +1) II. 2 sin 45^@ cos 45^@ - tan 45^@ cot 45^@ = 0 Which of the above identities is/are correct ?