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21. Find the principal values of the following

tan^-1(- 1)

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22. Find the principal values of the following

sec to the power of negative 1 end exponent open parentheses fraction numerator 2 over denominator square root of 3 end fraction close parentheses

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23. Find the principal values of the following

cot to the power of negative 1 end exponent open parentheses square root of 3 close parentheses

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Let space space space straight y space equals cos to the power of negative 1 end exponent open parentheses negative fraction numerator 1 over denominator square root of 2 end fraction close parentheses space space where space 0 less or equal than straight y less or equal than straight pi therefore space space space space space cos space straight y space equals space minus fraction numerator 1 over denominator square root of 2 end fraction space space where space 0 less or equal than straight y less or equal than straight pi therefore space space space space space cos space straight y space equals negative cos straight pi over 4 equals space cos space open parentheses straight pi minus straight pi over 4 close parentheses equals space cos space fraction numerator 3 straight pi over denominator 4 end fraction therefore space space space space space straight y equals fraction numerator 3 straight pi over denominator 4 end fraction

therefore space space space space space

required principal value =

fraction numerator 3 straight pi over denominator 4 end fraction

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25. Find the principal values of the following

cos e c to the power of negative 1 end exponent left parenthesis negative square root of 2 right parenthesis

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26. Evaluate

sin open square brackets 2 space cos to the power of negative 1 end exponent open parentheses negative 3 over 5 close parentheses close square brackets

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27. Evaluate sin[ tan^-1 (- 1) ]

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28. Find the value of tan^-1

open square brackets 2 space cos space open parentheses 2 space sin to the power of negative 1 end exponent 1 half close parentheses close square brackets

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29. Find the value of the following :

space space space space space space space space tan to the power of negative 1 end exponent left parenthesis 1 right parenthesis plus cos to the power of negative 1 end exponent open parentheses negative 1 half close parentheses plus sin to the power of negative 1 end exponent open parentheses negative 1 half close parentheses

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30. Find the value of the following :

cos to the power of negative 1 end exponent open parentheses 1 half close parentheses plus 2 space sin to the power of negative 1 end exponent open parentheses 1 half close parentheses

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