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If DeltaABC " if" angleA = pi/2 " then" ...

If `DeltaABC " if" angleA = pi/2 " then" cos^(2)B + cos^(2) C` equals

A

`-2`

B

`-1`

C

1

D

0

Text Solution

Verified by Experts

The correct Answer is:
C
` cos^(2) B + cos ^(2) C = cos^(2) B + cos^(2) ( pi/2 -B)`
`= cos ^(2) B + sin^(2) B =1`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-TRIGONOMETRIC FUNCTIONS -EXERCISE 1 Trigonomertric Ratio of Allied Angle
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