Q3 of 268 Page 4

Find the numerical value of the following :
sin45°.cos45° – sin²30°.

We know that,

Now, putting the values

Find the value of the following :

(i) sin 30^o + cos 60^o

(ii) sin² 45^o+cos²45^o

(iii) sin 30^o + cos 60^o – tan45^o

(iv)

(v) tan 60^o x cos30^o

If θ = 45°, find the value of

(i)

(ii) cos² θ - sin² θ

Find the numerical value of the following :

Find the numerical value of the following :sin45°.cos45° – sin230°.