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Question
The value of cos (270° + θ) cos (90° – θ) – sin (270° – θ) cos θ is ______.
Options
0
– 1
`1/2`
1
MCQ
Fill in the Blanks
Solution
The value of cos (270° + θ) cos (90° – θ) – sin (270° – θ) cos θ is 1.
Explanation:
cos (270° + θ) cos (90° – θ) – sin (270° – θ) cos θ
= sin θ . sin θ + cos θ . cos θ
= sin2 θ + cos2 θ
= 1
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