Question

what is the value of cos square 67-sin square 23

Answer 1

sin square(90-67)-sin square 23= sin square23- sin square 23=1

Answer 2

Answer:

value of trigonometric expression is 0.

Step-by-step explanation:

Given

cos² 67-  Sin²23 = ?

Now apply trigonometric 90 - Ф changes in the ratios

Sin ( 90 - Ф) = Cos Ф

and Cos( 90 - Ф) = Sin Ф

Cos²(90 - 23) - Sin² 23 =  Sin² 23 - Sin² 23 = 0

Hence the value of trigonometric expression is 0.