Q15 of 118 Page 5

Mark the correct alternative in the following:
If x is an acute angle and , then the value of is

Given x is an acute angle and value of tan x =1/√7.

⇒ We know tan²x + 1 = sec²x

⇒ Also, cot²x+1 = cosec²x

⇒ cot² x=7

⇒ cot²x+1 = 7+1

⇒ cosec²x = 8

∴

⇒

Mark the correct alternative in the following:

If , then tan x =

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is true if and only if

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The value of sin² 5° + sin² 10° + sin² 15° + … + sin² 85° + sin² 90° is

Mark the correct alternative in the following:

Mark the correct alternative in the following:If x is an acute angle and , then the value of is